This is one of three wooden puzzles I bought from the dollar store a while back (the quality matches the price). There's actually a modicum of artistic inspiration going on here. I saw this particular puzzle on my shelf and it somehow reminded me of the film Inception. In short, it's a mixture of the Escheresque scenes and the idea of architecting a dream world. I went with a extremely shallow depth of field to enhance that dream-like feel.
If you don't buy that explanation, well that's all I got.