By Staff Reporter (staff@latinospost.com) | First Posted: Sep 25, 2013 03:58 AM EDT

A video showing a group of eight German dancers creating an optical illusion that makes it difficult for the human eye to tell who performed the movements and which leg belongs to who in a game involving black and white colors went viral on the web.

In the video, the eight dancers are joined by their arms at the shoulder level, they make only leg movements and they are moving back and forth, and sometimes from right to left. The video posted on YouTube has 4 million views and it continues spreading on social networks.