The phenomenon of 'seeing' or imagining Tetris shapes and 'fitting' them around things is known as the 'tetris effect'[0] and is quite common. In my experience

The phenomenon of 'seeing' or imagining Tetris shapes and 'fitting' them around things is known as the 'tetris effect'[0] and is quite common. In my experience you don't need to play Tetris that long to experience it. It's so well known that the Tetris Company named one of their most recent games after it [1]. [0] - https://en.wikipedia.org/wiki/Tetris_effect https://en.wikipedia.org/wiki/Tetris_effect [1] - https://en.wikipedia.org/wiki/Tetris_Effect https://en.wikipedia.org/wiki/Tetris_Effect