Some of the most compelling optical illusions are often the simplest. Case in point: the drawings of Japanese artist Nagai Hideyuki. With little more than a couple of sketchbooks, some pencils, and a little perspective, Hideyuki's 2D drawings turn into a series of surreal, three-dimensional weirdfests.

We've included a handful of our favorites from Hikeyuki's extensive collection of illustrations below, but you'll definitely want to check out his website, facebook, and deviantART pages for tons more.

[Spotted on COLOSSAL]