3D Bicycle Drawing

A couple months ago Peter and I were talking about how to do 3D drawings. I was thinking of just doing line art and then shifting stuff around in different colored layers on the computer. But Peter happened to come across this little 3D drawing kit and picked one up for me:



It's this little plastic "compass" that holds a blue and red pencil in place so you can draw with both of them at the same time at a fixed distance apart from one another. Here are the instructions from the back of the package:



And here it is in use as I draw some practice shapes:



Today on my day off I was fiddling with my bike, and I swapped out my flat bars for some drops from a bike salvaged from the trash a couple months back. I did a quick ink drawing of it so I could trace it with the compass:



Here's the finished drawing. I started tracing at the rear wheel with the pencils very close together and then as I worked my way "forward" I moved the pencils farther apart. I'm not sure how well the 3D ended up working, but it still looks sort of cool:



Update: as soon as I posted this and was looking at the finished drawing again, I thought to check something. The blue pencil that came with the kit is totally the wrong color: if you hold the red lens of the glasses right against the paper then you only see the blue lines, but if you look through the blue side then both lines are clearly visible. I think actually the pencil is close to "true blue," whereas the glasses are cyan. I'll have to pick up a cyan pencil and see if I can get better results.