Get this device (and other variations) here:
From Amazon: BUY NOW: Moiré Fidget Device
Moiré Kinetic Wheel: sold as a fidget toy this device has two plastic disks and each has a pattern of curved spokes that can rotate independently and produce interesting illusions of motion via moiré interference effects. Explore constructive and deconstructive interference patterns with this minimalist toy.
Get these designs and many more here:
From Amazon: BUY NOW: Holiday Specs Holographic Glasses (full set)
From Etsy: BUY NOW: Holiday Specs Holographic Glasses
Get the tree and lights here:
From Amazon: BUY NOW: Tree Decoration, Set of LED lights
Holiday Specs: every point-source of light gets a holographic image overlaid: stars, snowmen, trees, candy canes, and snowflakes. The "lenses" in these glasses are actually transmission holograms but with the image located at the farthest point in the depth of field. Made by American Paper Optics with many more images available.
Get this chaotic fidget spinner here:
From Amazon: BUY NOW: Triple Pendulum Spinner
Triple Pendulum Chaotic Fidget: This interesting spinner is made from stainless steel and features three physical pendulums each mounted with their own low friction bearing. In slow motion one can see the kinetic energy and angular momentum is transferred from one pendulum to another as the entire device rotates, with some spinning rapidly and others rotationally at rest- the intricacies chaotic motion, characterized by extreme sensitivity to initial starting conditions, tiny differences in how the system is released leads to dramatically different outcomes each time.
These stickers transition back and forth and can be used on many surfaces. Get some here:
From Etsy: BUY NOW: Thermochromic Saftey Sticker
Thermochromic Safety Sticker: the liquid crystal ester dye in this reusable sticker is calibrated to change color when the surface temperature exceeds 50°C (122°F)- that at which prolonged contact (more than 0.5s) will burn skin. Here the safety sticker is attached to a slab of aluminum and heated with a simple candle- it took about 3.5 minutes for the heat to distribute and bring the aluminum to the threshold temperature. When the surface cools the sticker again appears blank and can transition over and over again
Get this puzzle here:
From Etsy: BUY NOW: Missing Edge Puzzle Card
Missing Edge Piece Puzzle: fun math involved in the design of this puzzle, which illustrates how the concept of area can challenge our intuitions. Swipe to see the similar and amazing Matsuyama’s Paradox puzzle. A precision crafted puzzle by Jeux Efcé game shop.
Get this beautiful 3D Print here:
From Etsy: BUY NOW: Kaleidocycle Fidget
Or print it yourself: Kaleidocycle print files
3D Print Kaleidocycle: this kinetic manipulation fidget toy is comprised of six hinges such that it can twist inwards continuously. Amazingly this item is 3D “printed-in-place”, which means it comes off the printer already assembled with movable links and ensures the color gradient is continuous across the joints.
Get this very nice laser cut version here:
From Etsy: BUY NOW: Desk Wobbler
Check out my posts on similar geometric objects: developable rollers
Wobbler Roller: a very simple toy today- two half circle perimeters affixed at right angles which surprisingly can then roll in a straight line with a peculiar wobble motion. When rolling, a wobbler always touches the table top at two points which could be connected by a straight line, and forms the frame of the geometric shape called a sphericon (featured in a previous post).
Get one here:
From Amazon: BUY NOW: Rainbow Twirler
Rainbow Twirler: shaped by angular momentum and centripetal acceleration- when the speed of the ribbon is faster than the flicker fusion frequency of human vision it looks like a bubble. As the rotation speed increases the shape flattens- similar to the way the Earth bulges due to its rotation. Found this fun motorized base for this item in a toy store last week.
Get this particular sand kinetic art here:
From Amazon: BUY NOW: Sandscape Kinetic Desk Toy
Click here for more amazing types of kinetic sand art.
Sandscape Spontaneous Stratification: a striking feature of this sand motion desk toy is the formation of striped layers. Typically pouring stuff together results in further mixing, yet here, when the sand mixture descends through a gap, the resulting pile is ordered into sorted layers. The larger rounded dark grains separate from the smaller sharp-edged white grains forming the layers you see here. The darker grains alone would stack into a steeper pile (larger angle of repose) than the white which would form a less steep pile.
Get this metallic lava version here:
From Amazon: BUY NOW: Metallic Lava Lamp
From explOratorium store: BUY NOW: Metallic Lava Lamp
See aslo: Magnetic Ferrofluid Lava Lamp
The Lava Lamp: with new pearlescent metallic “lava”- kinetic art with an amazing amount of physics on display: convective heat flow, Archimedes principle, surface tension (note how the smaller blobs form into spheres), and immiscible liquids to name just some of the science behind this famous device. In this loop one can see shock waves ripple through the blobs as they detach, and as they recombine at the bottom. Manufactured by Mathmos and invented in 1963 by Edward Walker of Dorset, England.
These aluminium 1 Yen coins are the perfect denisty to float as shown in the video:
From Etsy: BUY NOW: 1-Yen Coins (20)
Floating Yen: the surface tension of water is strong enough to suspend the aluminum coin, and a trapped column of air in a second glass can submerge a portion of the surface with the coin. The 1-Yen coin has just the right mass and density for this demonstration. One of my favorite DIY physics demonstrations.
Get one here:
From Amazon: BUY NOW
Vortex II Coin Bank
Vortex II Coin Bank: interplay of potential energy of gravity and conservation of angular momentum- a simulation of a decaying orbit. Fun with every coin saved!
Get this illusion here:
from Amazon: BUY NOW: Animallusions Zebra
or here: Illusion Animals
The original DIY dragon from G4G 3: Dragon.pdf
Animallusions Zebra: an amazing version of the hollow face illusion where the zebra’s head appears animated, and gives the impression that it’s always looking in the direction of the viewer. This zebra seems inspired by the dragon illusion created for the 1998 Gathering for Gardner by the Binary Arts Corporation of Bill Ritchie et al. Some fun physics of perspective and psychophysics for your shelf.
Get one here:
From Amazon: BUY NOW: Oil Drop Timers
Spiral Oil Drop Timer: when this drop timer achieves its steady state the drops form with amazing regularity in terms of both the size of the drop and the spacing between drops. The physics of immiscible liquids, surface tension, viscosity, and gravity combine to produce these interesting patterns.
Get this super nice, affordable, and fun to assemble kit here:
From KiwiCo: BUY NOW: Glow Pendulum Kit
Get amazing quatilty science kits delievered to your home- this glow pendulum is part of the Tinker Crate subscription.
From KiwiCo: LEARN MORE: Tinker Crate Subscription
Glow Trace Chaotic Pendulum: this fun and amazing DIY kit features a UV diode to trace the intricate path of this double pendulum system on to a phosphorescent screen, revealing the physics of chaotic motion. It’s amazing that such complex motion can arise from a simple assembly of two pendulums, one attached to the end of the other. Chaotic motion, such as that observed here, is characterized by extreme sensitivity to initial starting conditions, tiny differences in how the system is released leads to dramatically different outcomes each time.
From Amazon: BUY NOW
Metal Balance Bird and Stand
From eBay: BUY NOW
Metal Balance Bird and Stand
Metal Balance Bird: weights in the wing tips create a center of mass below the bird's beak- making a system in stable equilibrium. No magnets! This is the nicest version of this toy I’ve seen- with bird and iconic stand cast in zinc alloy metal.
Get this amazing model engine here:
From EngineDIY: BUY NOW: Simple Stilring Engine
See other featured DYI devices here: EngineDIY Models
Simple Stirling Engine: Perhaps the simplest piston engine ever devised- a single piston powered by a tiny alcohol lamp. Glass components allow a view of the internal workings of this design, and the interesting startup behavior from oscillation to full rotation. Heat engines produce mechanical motion from a difference in temperature- here the piston side is near room temperature (the central aluminum post is an excellent conductor and acts as a heat sink as the gas flows through), and the test tube is kept at high temperature via the flame, with metal fibers to help conduct the heat into the air (this component is called the regenerator). Swipe to see the elegant assembly of this model, and swipe again to see the engine power down. This external combustion design is attributed to Scottish engineer Robert Stirling back in 1816.