Illustration by artist <n>Jenifer Prince</n>.

<n>Greeting Card</n> (ca. 1860) by <n>Charles Henry Bennett</n>, published by <n>Goodall & Son</n>.

Photographs of <n>Mars</n>, <n>Jupiter</n>, <n>Saturn</n>, and <n>Pluto</n> from <n>Science Activities</n> magazine, 1959.

Spiral nebula seen on edge from the book <n>The Earth and the Stars</n>. Photo by <n>Mount Wilson Observatory</n>.

Astronomical illustration <n>The Sun</n> (1860) by an unknown artist.

<n>Simon Claridge</n>'s artwork of the November 1967 <n>Playboy</n> cover featuring model <n>Jean Bell</n>.

<n>Circle of Fifths - Music Theory Poster</n> by <n>pennyandhorse</n>.

<n>Blowfish</n> from the <n>Fish from American Waters series (N39)</n>, published by <n>Allen & Ginter</n>.

The print <n>Drainage Calavera</n> by Mexican artist <n>José Guadalupe Posada</n>.

<n>House by the Railroad</n>, a 1925 painting by <n>Edward Hopper</n>.

The digital illustration <n>Halloween Cats</n> by artist <n>Demian Asche</n>.

Illustration by <n>Josefina Schargorodsky</n>.

A playing card illustration from a series by artist <n>Mahdieh Farhadkiaei</n>.

Illustration of a <n>Fire-Ball</n> seen from the <n>Observatory at Juvisy</n>, August 10, 1899.

<n>Étienne Léopold Trouvelot</n>'s illustration, <n>Étoiles multiples colorées</n>, 1881.

The Seven of Hearts, illustrating "Who Killed Cock Robin?," by <n>Tony Meeuwissen</n> from <n>The Key of the Kingdom</n> (1976).

Ace of Diamonds from the <n>Submarine No.92</n> playing card deck, published by <n>Brown & Bigelow</n> in 1917.

Map of the Sultaniyya-Zanjan region from <n>Beyan-i Menazil-i Sefer-i Irakeyn</n> (1537) by <n>Matrakçı Nasuh</n>.

'Fear is the mind killer,' a quote from the <n>Litany Against Fear</n> in <n>Frank Herbert</n>'s <n>Dune</n>.