Get this convection candle here:
From Amazon: BUY NOW Spinning Kinetic Candles
Other convection turbines here on eBay:
From eBay: BUY NOW Spinning Convection Candles
Spinning Snowflakes Convection Candle: with chimney effect! This holiday candle is a simple turbine heat engine where rotational motion results from the convection of hot air from the candle flame of a tea light, which is also surrounded by a glass cylinder which enhances the convective flow via the chimney effect. A quick investigation finds the rotor spins twice as fast with the glass cylinder in place. All moving parts of thin stainless steel with some assembly required. Energy transfer: chemical bonds- to heat- to kinetic energy of the rising air- to rotational kinetic energy of the turbine and snowflakes.
This amazing toy for under $10:
From Amazon: BUY NOW: Gifeez Animation Toy
Gifeez: a modern zoetrope type device with built in strobe light to explore the physics and psychophysics of motion animation- still images flashed in rapid succession produces the illusion of motion through persistence of vision. This inexpensive device has two modes: 1) the strobe frequency is set to various ratios of the spin frequency creating fascinating motion of abstract geometrical images, and 2) the strobe is set to animate simple cartoons. When the image flash rate is above the flicker fusion frequency (approximately 16Hz) we perceive fluid motion- the basis for all movies and TV. This device includes a centripetal switch that turns on the strobe and a motor that keeps the disk spinning for a couple minutes and comes with 15 printed double sided disks and a few blanks to allow for your own designs.
This toy is availble from Amazon Japan and will ship to the US:
From Amazon.jp: BUY NOW: Reuleaux Rotor Wodden Toy
Reuleaux Rotor: this famous curve of constant width, the Reuleaux triangle, can rotate such that at all times it remains in contact with all four sides of a square. As demonstrated by this wooden toy from Japan, the rotor covers approximately 98.77% of the area of the square, missing only the sharp corners. The curves in the corners are in the shape of an elliptical arc. Fun fact: a Reuleaux triangle has a perimeter equal to pi times its width- just like a circle!
Get this amazing 3D print here:
From Etsy: BUY NOW: Seirpinski Pyramid
or print it yourself:
From Thingverse: Seirpinski Pyramid
Half Sierpinski Octahedron Fractal: this 3D printed math sculpture is one half of the sixth iteration of what is called “the octahedron flake” a 3D fractal based on the Sierpinski triangle. To make this fractal, on each iteration an inverted triangle is removed from the center of the previous triangle, and if this process is repeated indefinitely one gets the famous fractal. For this 3D print, the maker Travis Quesenberry used rainbow silk PLA to create the beautiful color gradient base on the .stl files by Rick Tu. Another example of math brought to life via 3D printing!