Ever wonder what's inside your favorite artist's sketchbook? Mattias Adolfsson has some of the most interesting ones we've seen, like a strange cross between Where’s Waldo and Dr. Seuss.

With healthy doses of absurdity and science fiction, the Swedish illustrator fills his sketchbooks to a degree that's almost manic. With robots, villages, churches, spacesuits and strange contraptions, there's room for everyone to take a dive into the inner workings of this talented doodler's mind.