Smooth Square Wheels

This is a just a fun little desk toy representation of the curve on which a square can roll smoothly, inspired by Vsauce's explanation of it in his video on brachistochrones (https://www.youtube.com/watch?v=skvnj67YGmw) and Devin Montes from Make Anything's use of 3D printing to represent the tautochrone (https://www.youtube.com/watch?v=dIip9yXK8-M) (both of which are really awesome and you should check them out!). Traditionally, you don't think of square wheels as being capable of turning smoothly and traveling only in a horizontal line. Similarly, we don't think of a non-flat road as being able to be driven across smoothly and traveling only in a horizontal line. The very specific geometries utilized in this toy, however, make both things possible. This toy also allows you to actually see and feel the squares turning, making it far more fascinating and a more visually interesting demonstration of the principle than just looking at an animation. A fun and easy print, this desk toy