Very cool indeed, especially because the concept is not something astonishingly complex. Check out NightMode and Exsistential Crisis I consider the latter one

Very cool indeed, especially because the concept is not something astonishingly complex. Check out NightMode and Exsistential Crisis I consider the latter one to be the crown of this concept. It looks even better and you have to memorize the structures laid, which makes it more interesting (especially since once you've grasped the original idea, the normal mode is not that hard at all)