Hi everybody! As Marshall suggested, I started by putting down some freehand ideas, then constructed the final version using ruler and tracing paper. Since I'm not that familiar with isometric perspective, and even less with impossible figures it was at the same time a really fun and frustrating ^^ Several questions came to me while doing this: - How to overcome the frustration of first tries failure? - How to keep the lines parallel and angles consistent when no guide instrument is used? - How to not be overwhelmed by the numerous construction lines that could appear? That's all for now, and thank you Marshall giving us a learning content of this quality :)