### Surf's Up!

Kyle Auga-- kinetic sculptures:

Check out Kyle's art here:

From Etsy:** BUY NOW Kyle's Kinetics **

Surf's Up!: Another gravity defying creation by Kyle Auga, this time a well-balanced stainless steel surfer that carves waves in the air for over 10 minutes on one push! The surfer has the curious motion of a 3D physical pendulum- a complex motion which can be broken down into oscillations along two dimensions and rotation about the point of contact. The stick figure plus counterweights and bar structure is designed such that its center of mass is few centimeters below the contact point when at rest. When the sculpture is tipped the center of mass swings under the pivot point in this stable equilibrium condition- no magnets needed to create this physics magic.

### Two Marble Puzzle

Similar 4 marble version of this puzzle available here:

From Etsy: **BUY NOW Four Marble Puzzle **

From Amazon:** BUY NOW: Two Marble Puzzle, **or get this** set of puzzles**

Two Marble Puzzle: physics brain teaser- move both marbles to their top locations on each side simultaneously. The solution to this puzzle relies on some fun basic physics principles- can you figure out which ones? Swipe to reveal solution. Found this well made version of this classic physics puzzle at a gift shop in San Francisco (note Golden Gate Bridge motif).

### Heart Gears

Get a nice 3D print made here:

From Etsy: **BUY NOW: Heart Gears**

Or print it yourself:

From Thingverse: Download Free: Heart Gears Print Files

Heart Gears: This 3D print is guaranteed to put your heart in a twist- comprised of eight bevel gears attached to an octahedron center block, with the axis of each gear oriented to the center of each face of the octahedron. Rotate any one gear 360 degrees and the heart shape will reform. Another amazing design by Emmett Lalish, first printed in 2014.

### Impossible Bottle Sculpture Puzzle

Mr. Evans makes a variety of amazing impossible bottle sculptures:

From impossiblebottle.co.uk: **Buy NOW Impossible Bottles by Philip Evans **

Nice Impossible bottles are often available on Etsy:

From Etsy:** BUY NOW Impossible Bottles**

Impossible Bottle Sculpture Puzzle: seemingly impossible, but created with clever engineering, this “impossible” bottle contains a padlock and full deck of cards still in the wrapper (a cut out in the side of the box reveals that all the cards are inside). The puzzle aspect is to consider how the bottle was produced (I personally have some theories- but I do not know the secrets of this artist). I can tell you with high certainty that the bottle was never cut or altered in anyway, and it was not somehow formed around the objects. This bottle by Phil Evans is one of the best I’ve seen.

### Phase Locking Folk Toy: Hooey Stick

Versions of the Gee Haw Whimmy Diddle available from these sources:

From Etsy: **BUY NOW: Hooey Stick Folk Toy**

From Amazon:** BUY NOW Hooey Stick Folk Toy **

From eBay:** BUY NOW Hooey Stick Folk Toy **

Phase Locking Folk Toy: rubbing the stick over the notches creates both vertical and horizontal vibrations- and leads to an elliptical motion of the nail in the center of a propeller, which begins to rotate due to friction with the nail. This toy is called a Gee-Haw Wimmy Diddle (see the Wikipedia page- I kid you not) or a Hooey Stick. Note that depending on how the stick is held, the propeller will spin clockwise or counterclockwise.

### Pentominoes

Get this set here:

From Etsy: **BUY NOW Hardwood Pentominoes **

Many versions available here:

From Amazon:** BUY NOW Pentominoes **

The book by mathematician Solomon Golomb that started the polyonomo recreational math craze:

From Amazon: **BUY NOW: Polyominoes **

Pentominoes: The 12 possible arrangements of five identical squares joined edge to edge. Since 5x12=60, the pentominoes can tile a 6 x 10 rectangle with no gaps (2339 ways to do this- yet even finding one solution is a challenge). I love this beautiful set from artist/woodworker Ron Moore where each pentomino is made from a different kind of hard wood.

### Golden Ferrofluid

Available on Etsy: **BUY NOW Gold Ferrofluid Cell **

Golden Ferrofluid: colloidal ferromagnetic liquid in a specially prepared water-alcohol suspension. Curious behavior results from the interplay between magnetic force and surface tension. I'm still investigating the gold coloring and the specific makeup of the clear suspension fluid- both trade secrets it seems. The gold color appears to be a thin coating at the boundary between the ferrofluid and the suspension liquid.

### Impossible Jar with Golf Ball

Get this "impossible" jar and other amazing things from this shop:

From Etsy: **BUY NOW: Impossible Jar & Golf Ball**

Impossible Jar with Golf Ball: a regular off the shelf golf ball somehow trapped within a standard glass jar. Neither the ball nor the jar were cut or glued in the fabrication process. The puzzle aspect is to consider how this object was produced (again, I have some theories- but I do not know the secrets of this artist). This incredible piece was made by craftsman and artist Nathan Nickerson, and comes with the golf tee display stand (a nice touch!)

### Scutoids

This set of 3D printed scutoids available here:

From Etsy: **BUY NOW: Scutoid container set**

Scutoids: a recently recognized form of geometric solids discovered in 2018. Scutoids have a different polygon on each end, and when packed together maximize stability and minimize energy when forming a boundary layer- such as the membranes around organs in living tissue. These 5-6 scutoids have pentagons on one end and hexagons on the other. Discovered by a collaboration of biologists and mathematicians in 2018, this set is sold by Recep Mutlu of 3DPrintBase.

### Trammel of Archimedes

Get similar devices here:

From Etsy:** BUY NOW **

Trammel of Archimedes

From eBay:** BUY NOW **

Trammel of Archimedes

Trammel of Archimedes: as the shuttles take turns completing their straight line journeys, the end of the crank arm traces an ellipse. Sometimes sold as a “do nothing machine” or “nothing grinder”, far from doing nothing this simple and crucially important mechanism demonstrates how rotational motion can be converted into translational oscillatory motion- such as how a piston can drive an engine’s crankshaft. This version was crafted from fine maple, cherry, and oak by artisan Neal Olsen.

### Mirror Anamorphic Cup & Saucer

Get a set here:

From Etsy: **BUY NOW **

Anamophic Cup & Saucer

Mirror Anamorphic Cup & Saucer: the cylindrical mirror of the silver cup reflects and reveals the distorted scene of a carousel ride with four horses and the buildings of Macau Heritage City. The shape of the mirror allows for a mathematical operation, a type of affine transformation, to map the distorted image on the plate to the restored image reflected on the cup. A nice example of mirror anamorphosis through the medium of ceramics.

### 10 Hex Puzzle

This and other beautiful and well made puzzles are available on Etsy:

From Etsy: **BUY NOW 10 Hex Puzzle **

Two great resources about these polyhexs: polyform puzzler page and puzzleworld page

10 Hex Puzzle: this puzzle is comprised of pieces which are the set of all ways three and four hexagons can be joined with a common edge. There are 3 trihexs and 7 possible tetrahexs, and similar to pentominoes, these 10 polyhexs can assemble into a large hexagon. Amazingly there are exactly 12,290 solutions to this puzzle- but it’s still a challenge to find just one!

### Platonic Solids Dice Set

Get this nice set of regular polyhedra dice here:

From Etsy: **BUY NOW: Polyhedra Dice Set**

Less expensive sets of standard plastic dice here:

From Amazon: **BUY NOW: Polyhedra Dice Set**

Platonic Solids Dice Set: The five famous convex regular polyhedra in the form of fair dice. This set is cast in metal with clean edges and makes for a great way to own these symmetrical objects that have fascinated thinkers ever since the ancient Greeks wrote about them circa 360 BC. Only these five forms meet these criteria (in 3D space) for each face: must be equal in size, be equal in number of sides, each side of equal length, identical in angle were any two sides meet, and have the same number of sides meet at each vertex point of the solid. 2000 years later the famous mathematician Euler determined that for these 5 shapes V-E+F=2, the number of corners (vertices), minus the number of edges, plus the number of faces, will always equal 2.

### Earth Mass Black Hole

Precision machined tungsten alloy spheres avaulable here:

From STEMCell Science: **ORDER NOW: Tungsten Black Hole Replica**

Earth Mass Black Hole: this sphere of tungsten alloy has a diameter of 17.7mm, a precision representation of the size of the event horizon of a black hole with a mass equal to that of the Earth! If the entire mass of the earth could somehow be compressed to the size of this sphere, it would indeed collapse to a black hole with an event horizon defined by a Schwarzschild radius of 8.87mm. For comparison a black hole with the mass of the sun would be 6km across. This black hole replica is made of one of the densest materials available, a tungsten alloy with ?=18.5 g/cm³ which produces a strange sensation when you hold it, with a weight of twice that of a ball bearing of equal size.

### Wine-Themed Kaleidoscope

precision aligned high quality front surface mirrors:

From Etsy:** BUY NOW Precision Teleidoscopes **

Fine art kaleidoscopes avaibable here:

From Etsy: **BUY NOW: Fine Art Kaleidoscopes**

Wine-Themed Kaleidoscope: precision construction using surface coated mirrors set at an angle of exactly 72 degrees creates the beautiful symmetry of a five point mandala in this artisan kaleidoscope. The viewing cell is filled with shiny and colorful wine themed trinkets- grapes, vines, and other items found in and around a winery. Swipe to see more of the intricacies of the patterns produced by turning the viewing cell. Invented by the famous Scottish physicist Sir David Brewster (1781-1868), the kaleidoscope is an ultimate physics toy and entire field of artistic endeavor.

### Hybrid Kaleidoscope

High quality kaleidocsopes available here:

From Etsy: **BUY NOW: Fine Art Kaleidoscopes**

@physicsfun features a wide vatiety of kaleidoscopes (click to explore)

Hybrid Kaleidoscope: the beautiful symmetry of multiple reflections in a unique design- part teleidoscope (image from spherical lens) and part kaleidoscope (image from colorful objects in viewing cell). Invented by the famous Scottish physicist Sir David Brewster (1781-1868), the kaleidoscope is an ultimate physics toy and entire field of artistic endeavor. This vintage find is labeled “C. Bennett Scopes for AKAG 1984”.

### The Heritage Periodic Table

Periodic Table with 83 element samples:

From Etsy store ProtoshopLLC :** BUY NOW **

Heritage Periodic Table

**See also: The Collector's Edition with 85 samples**

**Please note:** there are fradulent versions of this with only pictures embedded in the acyrlic being sold on facebook. The link above is the only place to get the actual version.** **

The Heritage Periodic Table Display: a comprehensive collection of the chemical elements that can fit in the hand. Embedded in acrylic are actual samples of 83 of the 118 elements- including pure bubbles of the gaseous elements- represented by 75 high purity samples and 7 compounds. 2019 marks the 150th anniversary of the world changing periodic system of Dmitri Mendeleev (published in 1869). This table and collection is the creative work of Tim and Cory Marriott of Engineered Labs Protoshop LLC