A shading exercise, I believe.

From an assignment to make self-descriptive words.
Actually, though, I just find the idea of letter balloons floating away to be fun ;)

 
Rounded things, and a bunch of different things, on lined paper.

 
Spiral staircases and a stormy parallel universe with water features :)

 
Books and twirly bits, on lined paper.

 
Exercises in perspective that got way out of hand ;) Drawn on old brown paper.

  
Also from the old brown paper: campfire, on fire; person’s leg, on fire; and log, not on fire ;)

  
Old circle designs, drawn on lined paper.