Rafael Araujo’s illustrations are bafflingly complex—so complex that you might assume the artist uses a computer to render the exacting angles and three-dimensional illusions. And true, if you were to recreate his intricate mathematical illustrations using software, it probably wouldn’t take you long at all. But the craziest part of all is that Araujo doesn’t use modern technology to create his intricately drawn Calculations series—unless, of course, you count a ruler and protractor.

*[MORE: Wildly Detailed Drawings That Combine Math and Butterflies]*

(via wired)