Mirror tic Tac Toe by Peleg Design is a rad little optical illusion board game with half o's and X's that only are complete when put in play.

In the standard view, where dark matter isn't the antimatter, the Universe is left with only one half of the broken mirror.

When I awoke in the morning, there was a message scribbled on my mirror in red lipstick:“Heartily know, when half?gods go, the gods arrive.”I