It is a slick trick. The only problem is the Target TagsVery cool. We have some larger exterior signage cabinets that have doors that use gas cylinder assists. I can see where this technique would be useful for that if I were to ever animate them.
I had to check to be sure, because I see it too. It is an illusion causedThe proof worked. But for me (maybe I'm wrong) there is an error in the base. The hole stays at the same place, as it should, but it looks to me as it would move in the arm. The pivot of the arm seems slightly off; at least that's my perception.