Italy 🇮🇹, Milan

Visitors to the Giuseppe Meazza Stadium, also known as the San Siro, descend down a spiral staircase on one of the side towers. When looking at the staircase, it seems that it is rotating. 

But in fact, the ladder is not moving. This visual effect is created due to the large number of people moving down the stairs in one direction. The result is an impressive optical illusion!

And what do you see? Does it seem to you that it rotates or not?