Optical Illusion Pen Holder – Round or Square?

This pen holder is based on the fascinating work of Kokichi Sugihara, known for his mind-bending optical illusions, and inspired by the original STL model from Dandy Cat Lab.I remixed their design to create this functional version: depending on the viewing angle, the holder appears either perfectly round or perfectly square.It’s not just a pen holder – it’s also a fun conversation piece for your desk!🔹 Remix of the base model by Dandy Cat Lab🔹 Optical illusion concept by Kokichi Sugihara🔹 Printed version adapted as a practical pen holderDownload it, print it, and enjoy the surprise effect when you turn it around.One click costs you nothing, but it means the world to me — whether it’s a like or a boost, your support makes the magic happen.