Math Toys

Frabjous Geometric Sculpture Puzzle

Get one here- five colors to choose from:

From MoMath: BUY NOW: Frabjous Sculpture Puzzle

Frabjous Geometric Sculpture Puzzle: 30 identical laser cut acrylic pieces interlock into 12 interconnected five point stars (each with a spiral vortex center) in this puzzle based of the Frabjous sculpture by artist and professor of mathematics George Hart (Prof. Hart is now on Instagram, follow him at @george.hart.sculptor to see more of his amazing work.) Note that if one connects the tips of the stars one gets the outline of a dodecahedron, with its 30 edges and 12 sides, and if one considers the face planes of the linked pentagrams the underlying shape is a polyhedron called the “great rhombic triacontahedron”. A year or so ago I got to visit the National Museum of Mathematics in NYC where I bought this puzzle in the @momath1 museum shop. This puzzle was great fun to assemble- buy one to support this inspirational museum, and make a great sculpture for your bookshelf! 

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. 

Pencil Hyperboloid

Choose your color and get one here: 
From Etsy: BUY NOW 
Hyperboloid Pencil Holder 

don't forget a set of pencils: 
From Amazon: BUY NOW 
Colored Pencil Sets 

Better yet- get some thermochromic color changing pencils! 
From Educational Innovations: BUY NOW 
Heat-Sensitive Pencils 

Pencil Hyperboloid: a perfect gift for any math teacher- the precisely oriented holes in this base direct 16 pencils to reveal a hyperboloid, the 3D surface traced by revolving a diagonal(skew) line, the outline of which is the conic section of the hyperbola. A doubly ruled surface for any desktop!

Wooden Trapped Sphere in Cube

Get this curiosity here:

From Art of Play: BUY NOW: The O-Cube

Trapped Sphere in Cube: a surprising aspect of the geometry of spheres and cubes- carved from a single block of wood is a sphere trapped within a cube frame. A classic folk woodworking novelty reconceived here with precision machining to create this seemingly impossible object.