Celebrating 40th anniversary of Pink Floyd’s dark side of the moon with listening to their album the whole day? Come on, you can do much better than that. Like, Uumm. What about playing chess! What? (Taylor Swift style). Yeah, chess! Look at this dark side of the moon’s t-shirt, a checkered “tee-shirt-board” arranged in an eight by six grid, you can play your own Pink Floyd’s chess game with this shirt. Ask someone to play the chess game with you, and together join the dark side of the moon.