000000 | 1F1F1F | 3B3B3B | 595959 | 8E8E8E | B8B8B8 | D5D5D5 | FFFFFF |
After posting four of the simple machines over the last week and a half, I decided I would post an abstract picture of tank tread because it includes so many simple machines in the form of wheel/axles, gears (wheels with wedges), levers, and screws.
I hope you like the stark black and white treatment.