I wasn't quite sure what "respond" meant but now I know it's not quite what you were looking for... I kind of just imagined what the other half of the image could look like instead of drawing what it actually did. On the right side I practiced the shading techniques (stippling/cross-hatching).
Sketchbook #3 ––– Keys Contour
I was unable to photograph this exhibit.
Sketchbook #4 - How to Make Toast
Sketchbook #5 – Mechanical Object
Sketchbook #6 – Coffee Mug Contour
Sketchbook #7 – New Tools
Sketchbook Drawings