Visual Illusion

thingiverse

To meet the Thingiverse Blog challenge http://blog.thingiverse.com/2012/02/21/oo-someone-make-one-of-these/, I present my initial effort in creating a 3D printed optical illusion of balls rolling uphill. From the correct angle, it appears that all four ramps lead to the central platform. Any other viewpoint reveals the trickery. Keen to test its effectiveness, I couldn't resist taking on the challenge!