VIDEO AND PICTURE: Tic Tac Toe Water Games by Studio Kahn

This is very simple concept by Israeli's Studio Kahn –The Water games. Just insert your fingers into the X and O spot in tic-tac-toe game and they will light up.

"Players dip their fingers in circles filled with water, which light up green or blue on contact. Underneath the porcelain unit lies a complex matrix of wires that make the magic happen."