Linear perspective is something I have not done much of in these past couple of months. Hell, my bg in my illustrations or sketches usually rely on it at its simplest form. So, having this class has helped me a lot do something I have been meaning to do (for a while now).
Creating a chair using a bunch of boxes.
Vacuum Cleaner from different views then do in a 3/4 view.
This was done in Sketchbook class. Initial drawing was 2 minutes long from my memory.
Afterwords I put the light/shadow using the reference.