This work is part of a short I'm working in, called "Ascending & Descending". It is inspired in the artwork from MC Escher, who did very advanced perpective works you can confuse with CG in a time computers were still making only simple calculum tasks and were too big and expensive for having one at home. Another interesting fact is that he used lithographs and wood engravings on most of his work.

This image has some paradox triangles and also gives the idea of a perpetual motion engine on the waterwheel, challenging not only geometry, but also physics with the impression of a continuous gravity that generates continous energy. It has always been a dream to me to make something with that "escher's" impossible feeling.

The main work wasn't in modelling/rendering, but in converting isometric perspective into 3d, with the help of photoshop. I will soon make a small tutorial of how I did it and the different renders.
The image I have inspired in can be viewed here: http://www.mcescher.com/Gallery/recogn-bmp/LW439.jpg
Other incredible escher's works can be viewed in this page:
http://www.mcescher.com/