Rest in peace, Kosmo. Read the rest
The hollow-face illusion is put to good effect here.
The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.
While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to track a moving viewer, a hollow face can appear to move its eyes faster than the viewer: looking forward when the viewer is directly ahead, but looking at an extreme angle when the viewer is only at a moderate angle.
Is the hollow-face illusion not working for you? Again, from Wikipedia: The Hollow-Face illusion is weaker among people with schizophrenia and other populations with psychotic symptoms perhaps as a result of reduced tendency to interpret any kind of ambiguous 3D object as convex. It appears to be related to current mental state, namely in regard to current positive symptoms, inappropriate affect, and need for structure. The illusion seems to strengthen among successfully treated patients.Read the rest
The sun lights things from above, so our brains are used to seeing shadows appear below convex things and above concave things. It's easy to trick your brain by rotating a map or photo upside down. Read the rest
Spinning things with contrasting stripes are evidently mesmerising. Read the rest
I could watch this all day.
These vintage cards and old placards display optical illusions, visual witticisms, hidden images, rebuses, and artistic paradoxes from yesteryear. They were the equivalent of Gifs back then — eye candy worth sharing. Here they are gathered in a oversized paperback for your entertainment and amazement.
The Playful Eye: An Album of Visual Delight by Julian Rothenstein, Mel Gooding Chronicle Books 2000, 112 pages, 9.9 x 0.5 x 12.7 inches, Paperback $9 Buy on Amazon
M.C. Escher: Adventures in Perception (1971) is a 20-minute Dutch documentary about the artist and includes scenes of him working in his studio. From Open Culture:
Obsessed with perspective, geometry, and pattern (Escher described tessellation as “a real mania to which I have become addicted”), his images have, by the count of mathematician and Escher scholar Doris Schattschneider, led so far to eleven separate strands of mathematical and scientific research.
The twenty-minute Adventures in Perception, originally commissioned by the Netherlands’ Ministry of Foreign Affairs, offers in its first half a meditation on the mesmerizing, often impossible world Escher had created with his art to date. Its second half captures Escher in the last years of his life, still at work in his Laren, North Holland studio. It even shows him printing one of the three titular serpents, threaded through a set of elaborately interlocking circles, of his very last print Snakes. He never actually finished Snakes, whose patterns would have continued on to the effect of infinity, and even says here of his officially complete works that none succeed, “because it’s the dream I tried for that can’t be realized.”
This picture has NO red pixels. Great demo of color constancy (ht Akiyoshi Kitaoka) pic.twitter.com/pZHvbB6QHE— Matt Lieberman (@social_brains) February 27, 2017
My daughter send this photo to me. I put it in Photoshop to check. The "reddest" part I could find using the eyedropper had an RGB value of 153/181/182. So technically there is some red in the image, but here is what 153/181/182 looks like:
Not very red! Read the rest
The guy in the cap doesn't get it, but the smart bald guy in glasses knows how it works. From the Bell Science Series film, "Gateways to the Mind" (1958).
Watch the full film (complete with nostalgically warbly soundtrack): Read the rest