Symmetric drawing with a rhombus linkage - GIF

[ToolTalkBot]

Symmetric drawing with a rhombus linkage.




Previously:

1755 drawing instrument set - photos
Camera lucida drawing aid - GIF
Drawing a circle using a square - GIF
Drawing a perfect circle on a chalkboard - GIF
Drawing three right angles on a sphere - GIF
Wrist flick circle drawing technique - GIF

[Karl_H]

I have never seen the geometry of the linkage; and such a great animation to demonstrate it.

[Floradawg]

Obviously, there are people who can visualize things in their minds that most people could never imagine. This looks like a good example.