This helmet below is painted with an interesting pattern consisted of connected Necker cubes. I’m not sure wether we mentioned it here before, but the Necker cube is an optical illusion first published as a rhomboid back in 1832 by Swiss crystallographer Louis Albert Necker. It’s beauty lies in a fact that it can simultaneously be seen in #multiple ways. Observing the helmet produces two different interpretations of cubes and empty cubical space between them – they can easily be switched! Most people see the lower-left face as being in front most of the time. This is possibly because people view objects from above, with the top side visible, far more often than from below, with the bottom visible, so the brain “prefers” the interpretation that the cube is viewed from above. Another reason behind this may be due to the brain’s natural preference of viewing things from left to right, therefore seeing the leftmost square as being in front. Check these two examples we featured before for more eye-candy!