A nice example of how we infer object position from what we presume to be a cast shadow pic.twitter.com/Gi1J1hVVUa

— Gavin Buckingham (@DrGBuckingham) March 24, 2020

no line in this video is actually changing size pic.twitter.com/nm5ZyhHnQM

— Chaz Firestone (@chazfirestone) January 3, 2020

The Mephisto Spiral optical illusion makes look the spirals unwind and never come apart https://t.co/3mxP808vaI pic.twitter.com/5hs1HV1Tjv

— Massimo (@Rainmaker1973) December 6, 2019