
Vision Crystal by the American artist Alex Grey (born November 29, 1953)

Vision Crystal by the American artist Alex Grey (born November 29, 1953)

Some examples of impossible geometry (poster at Tarquin)
« Le noir, une non-couleur ? Où avez-vous encore pris cela ? Le noir, mais c’est la reine des couleurs ! » — Renoir (1841-1919)
• “Black, a non-color? Where did you get that idea? Black, why, it’s the queen of colors!”

When you stare at the cross for at least 30 seconds, you see three illusions:
• A gap running around the circle of lilac discs;
• A green disc running around the circle of lilac discs in place of the gap; and
• The green disc running around on the grey background, with the lilac discs having disappeared in sequence. — Lilac Chaser, Wikipedia
Elsewhere Other-Accessible…
• Troxler’s fading at Wikipedia
“The fact is, that, of all God’s gifts to the sight of man, color is the holiest, the most divine, the most solemn.” — John Ruskin, The Stones of Venice, Vol. 2 (1853)
Chimerical colors (from Wikipedia)
(click for larger)

A handsome hamsa (image from The Fair Trade Store)

Abyss-illusion rug in blue and yellow (image from Temu)

Golden Light (1893) by John Atkinson Grimshaw (1836-93)