Having balanced cubes and blocks, our final challenge was to balance a two dimensional tile. This proved to be almost impossible. The real-life tile is of course...Show more 3D, it has thickness. We tried to give a slender tile stability by a support in front and back, this was no succes. Now we have given the tile considerable thickness. The pieces are the pentominoes and the goal is to balance a 8x8 tile with a 2x2 central hole on a stand with two supporting unit planes. There are eight solutions but just six are stable. Besides a 8x8-2x2 center other challenges are possible.