Can You Figure Out How This Guy's Hand-Drawn Illusions Work?

You’ve probably seen a good share o optical illusions, but what Italian artist Alessandro Diddi creates is simply mindblowing.

His forced-perspective illusions with cut paper, pencils, his hands and props go beyond the basic description of 3D art and are really hard to figure out.

Alessandro uploaded an album of his work to imgur and it went viral, racking over got 400,000 views in the 10 hours or so since it was posted. It’s certainly raising a lot of questions, such as “but how?”, “where can I get one?” and “whaa?”
Here are the images: