Alexei Pazhitnov (creator of Tetris)

I'm always thinking about how the player will be intrigued, how he will be puzzled, how he will figure it out, how to fool him, says Alexei Pazhitnov, known as Mr. Tetris. He is the man who created the game. How did Tetris look like at the very beginning and what's the story behind the blocks themselves? https://www.ceskatelevize.cz/porady/10441294653-hyde-park-civilizace/9271-english-versions/44529-alexei-pazhitnov/