More school work;

left; basic cube with elements and 'cuts' thrown in
top; was tasked with adding slanted walls etc. to make new surfaces.
bottom; some sort of final drawing including these things, unfinished. I kinda have a problem with my scanner here; the 3 segments of this image were scanned under the same settings, but are nothing alike. Pretty annoying.
This was also our introduction to handling shadow perspective, sadly many angles and lines coincide so not a lot of interesting shadows happen :)