A team of engineers from the Swiss Federal Institute of Technology Lausanne (EPFL) designed Mori3, a robot that can morph from a basic triangle shape into nearly any 3D object.

Kandinsky ran a little test on people and found yellow triangle, red square, and blue circle. Later, in 2002, Thomas Jacobsen tried to replicate the experiment and came up with different results ...

In two dimensions, the Reuleaux triangle has the smallest area of constant-width shapes. You can draw this shape yourself using a sort of three-way Venn diagram.