model Le Corbusier sun path models I've never seen these before, nor do I fully understand how they work, but I really like them. They're simple and elegant and I'm sure are very concise representations.
The sun 'travels' different paths throughout the season. The summer sun is high, while the winter sun is low. Passive solar design situates the house and is built with certain materials to help it to be warm in the winter and cool in the summer.