
Some examples of impossible geometry (poster at Tarquin)

Some examples of impossible geometry (poster at Tarquin)

The colonial cyanobacterium Nostoc commune (image from Wikipedia)
Post-Performative Post-Scriptum…
The title of this incendiary intervention is a reference to the French phrase nostalgie de la boue, literally meaning “nostalgia for mud” and referring to a longing for social or sexual degradation.

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
Pol. How say you by that? Still harping on my daughter: yet he knew me not at first; he said I was a Fishmonger: he is farre gone, farre gone: and truly in my youth, I suffred much extreamity for loue: very neere this. Ile speake to him againe. What do you read my Lord?
Ham. Words, words, words. — Hamlet (c. 1600), Act 2, Scene 2
Chimerical colors (from Wikipedia)
(click for larger)

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

Viper’s bugloss, Echium vulgare (L 1753)
Also known as: blue devil, blue thistle, blueweed, snake flower; Gewöhnlicher Natternkopf, Blaue Natternkopf; vipérine commune, vipérine vulgaire, serpentine; viperina azzurra; viborera, viperina; gwiberlys; żmijowiec zwyczajny; naderles; ლურჯი ძირწითელა; 蓝蓟; синяк обыкновенный; etc.
Post-Performative Post-Scriptum…
pard, n.¹ A panther, a leopard; (also) an animal resembling these. Now archaic.
pard, n.² A partner, esp. a male partner; a comrade, a mate.
• Oxford English Dictionary
I knew what the Sempervivum plant looked like:

Sempervivum × giuseppii (from Wikipedia)
But I’d never seen the flowers until a few days ago:

Sempervivum flowers (from Gardener’s Path)
They remind me of Clark Ashton Smith’s “The Demon of the Flower”:
Not as the plants and flowers of Earth, growing peacefully beneath a simple sun, were the blossoms of the planet Lophai. Coiling and uncoiling in double dawns; tossing tumultuously under vast suns of jade green and balas-ruby orange; swaying and weltering in rich twilights, in aurora-curtained nights, they resembled fields of rooted serpents that dance eternally to an other-worldly music. — “The Demon of the Flower”, Astounding Stories, Dec 1933
The Chills, Submarine Bells (1990)
(Source)
Elsewhere Other-Accessible…
• The Chills — official website