The first BBC television test card was designed in 1967.
I grew up with this on my TV during the ‘70’s, when there were only three channels. Half the time, there was no programming, so from midnight until morning they would display a test card instead of a programme.
Over the time, the clown really started to freak me out. So I decided to recreate it with Wednesday and a Ouija Board instead of the blackboard tic tac toe game.