Besides the fact it is not a tetris, I have issues with this. It looks great. But in a shop? And the guy is talking about standing on it. No way. I say take the wheels off, and make it for a kid. If it has wheels, chances are a kid will try to stand on it anyway, and land on his/her face. So I would say take the wheels off, and put some carpet or something on the bottom to make it easy to slide around. In fact, without the wheels I imagine some people would want it for themselves. Probably a lot of you have enough small pieces floating around your shop you could just make one from that.
https://www.instructables.com/id/DIY-Tetris-Shop-Stool/?utm_source=newsletter&utm_medium=email
https://www.instructables.com/id/DIY-Tetris-Shop-Stool/?utm_source=newsletter&utm_medium=email