relations, natural transformations, forms, functors

isomorphism

*Specimens of Fancy Turning* (1869)

Geometric pattern from <n>Specimens of Fancy Turning</n> (1869) by <n>Edward J. Woolsey</n>.

A work from the <n>Operators series</n> by artist <n>Andreas Gysin</n>.

A plate of <n>Chladni figures</n> from <n>Ernst Chladni</n>'s 1787 book, <n>Entdeckungen über die Theorie des Klanges</n>.

Generative artwork created for the <n>Genuary 2023</n> prompt, <n>Yayoi Kusama</n>.

<n>Sedimentary rocks</n> (1977) by photographer <n>William A. Garnett</n>.

<n>Meta weaving #2</n> is a handwoven cotton textile colored with plant dyes like goldenrod and logwood.

<n>Módulo 11</n> by <n>Oscar Niemeyer</n>, 1958.

<n>EROSION, MAYBE</n>, a work of <n>generative art</n> from 2023 exploring the concept of digital erosion.

<n>Marine</n> (1926), a <n>Surrealist</n> painting by <n>Max Ernst</n>.

The first 9 overtones of the harmonic series visualized by <n>Looma</n> on a <n>Tektronix 760a Vectorscope</n>.

A model for the <n>German Pavilion at Expo 67</n> in Montreal, designed by architect <n>Frei Otto</n>.

Photographic juxtaposition by editor <n>Stefan Lorant</n> for <n>Lilliput</n> magazine, 1937. The left photo, "Our Lily," is by <n>Bohumil Kröhn</n>.

<n>Walter Leitner</n>'s <n>Sculptural Precast Concrete Wall</n>, 1960s.

A <n>Suiseki</n> viewing stone from British Columbia, documented by <n>Bill Hutchinson</n> in 1976.

Diffraction patterns for natural and synthetic fibers from the <n>Encyclopedia of Polymer Science and Technology</n> (1967).

<n>Cenotaph for Newton</n>, a 1784 architectural drawing by <n>Étienne-Louis Boullée</n>.

Photo by <n>U. Grigull</n> and <n>W. Hauf</n> from <n>Milton Van Dyke</n>'s "<n>An Album of Fluid Motion</n>" (1982).

A <n>Flannelette nightdress</n> undergoes a fire test in 1910, from a pamphlet by the <n>British Fire Prevention Committee</n>.

Spiral waves observed in a fertilized egg during a study by <n>Massachusetts Institute of Technology</n>.