Markus Kniebes Journal urn:uuid:f309611976aa465823090a4734dca785 2023-27-09T15:58:10 <![CDATA[Another brain-frying optical illusion: What color are these spheres?]]> urn:uuid:60002 2021-05-04T18:48:30 Another brain-frying optical illusion: What color are these spheres? – und wenn man sich noch so anstrengt… (via Kottke)

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