These are very interesting and a bit trippy.

Existing in Empty Spaces caught my eye the most because it appears to be an optical illusion of various magnitudes. The varying size of the lines give depth and shape on a two dimensional plane, and (what's that green thing, a lizard?) the object which appears to go between the line spaces may not actually go between them at all, but behind them entirely.

I had to blow this thing up and stare at it in different ways and am still not entirely sure if the green thing is moving in and out of the line spaces, but I'm convinced it's entirely behind the line spaces.