This was from an extremely challenging draughting class where we learned perspective techniques and such. Sloppy work was sometimes put up at the front of the class with "who's rubbish is this?" written on it. In this assignment we had to morph one object into another in six even steps, rendered isometrically with contour lines that had to fade with distance. Difficult, but fun. I still use both the pencil sharpener and the wrench.