The art in this comic is probably what makes it so much like Calvin and Hobbes as well; the empty white space and backgrounds that draw the eye to the characters, the backgrounds also provide minimal detail but are very distinct and let you know exactly where in this universe you are with the characters - including when you are in an imaginary world, etc.
The only thing I have not seen is the large panel backgrounds that Watterson would make, complete with obsessive references to early comic panels.
