I stumbled across the concept of Ambiguous Cylinders at the makeanything YT channel. These were shown by Kokichi Sugihara in Japan.
I modelled a version of the circle/square variant myself and arranged them to act as an intriguing pen holder for my work desk
For printing I suggest using a 0.6mm nozzle to save some time. The GCODE provided is sliced for a Prusa Mini+ with a 0.6mm nozzle
If you want one and do not have a printer or the filament color you like, DM me.
You can find this Pen Holder on my Etsy Shop
Tips are highly appreciated!
The author marked this model as their own original creation.