Engraving of the letter A from <n>The Human Alphabet</n> by artist <n>Giuseppe Maria Mitelli</n>, 1683.

An illustration of the skating move <n>Forward Double-Three-Change-Double-Three</n>.

<n>Discomedusae, Plate 8</n> (1904) by <n>Ernst Haeckel</n> from his collection <n>Kunstformen der Natur</n>.

<n>A Celestial Eye, viewing the Objects of the Creation</n>, an engraving by <n>Thomas Wright</n> from 1750.

Engravings from <n>The Splash of a Drop</n> (1895) by physicist <n>A. M. Worthington</n>.

<n>The Earth, Plate XXX</n> from <n>Thomas Wright</n>'s 1750 book, <n>An Original Theory or New Hypothesis of the Universe</n>.

<n>Plate 75, Volume 3</n> from <n>A. G. Mayer</n>'s <n>Medusae of the World</n> (1910).

<n>The Comical Hotch-Potch, or the Alphabet turn'd Posture-Master</n> (1782), published by <n>Carington Bowles</n>.

The <n>Baroque</n> style etching "<n>Letter 'B'</n>" (1656) by designer <n>Jan Chrystian Bierpfaff</n> and engraver <n>Jeremiasz Falck</n>.

From <n>The Splash of a Drop</n> (1895), a series of shadow photographs by physicist <n>Arthur Mason Worthington</n>.

<n>The Moon—An Expired Planet</n>, an 1898 illustration by <n>Agnes Giberne</n>.

<n>Discomedusae</n> (1904), a lithograph by <n>Ernst Haeckel</n> from his book <n>Kunstformen der Natur</n>.

Polyhedral models by mathematician <n>Max Brückner</n> from his 1900 book <n>Vielecke und Vielflache: Theorie und Geschichte</n>.

An <n>Octopus macropus</n> chromolithograph by <n>Jean Baptiste Vérany</n> from his 1851 book <n>Mollusques Méditerranéens</n>.

W&B