Here are some more good ones: https://www.sciencealert.com/this-3d-optical-illusion-will-make-you-question-the-shape-of-known-reality-kokichi-sugihara https://

Here are some more good ones: https://www.sciencealert.com/this-3d-optical-illusion-will-make-you-question-the-shape-of-known-reality-kokichi-sugihara https://www.sciencealert.com/this-3d-optical-illusion-will-m... ... which embeds my all-time favorite ("Ambiguous Cylinder") https://youtu.be/oWfFco7K9v8 https://youtu.be/oWfFco7K9v8