refinery

A sepia-toned photograph of two ginkgo leaves by <n>Jeff Friesen Images</n>.

A <n>Van Dyke Brown Print on Fumed Alumina Treated Paper</n> by artist <n>Mark Hilliard</n> from 2015.

A digital floral artwork by <n>Artistería</n> exploring motion-blur effects.

<n>Spectral Beauty</n>. Photo by <n>Samuel Burgess-Johnson</n>.

A floral arrangement of <n>baby persimmons</n>, <n>mushrooms</n>, and <n>dried agapanthus</n>.

A group of <n>bear cubs</n> climb a tree in Manitoba, Canada.

<n>Gingko</n> by photographer <n>Arndt</n>.

<n>Ginkgo leaf pair</n>. Photo by <n>Jeff Friesen Images</n>.

<n>Biorhythms</n> by photographer <n>Nik Barte</n> from his <n>DesArtification</n> project.

<n>Held Up</n> (2009) by <n>Brooks Shane Salzwedel</n>.

A <n>Toyoboprint chine-collé</n> by artist <n>Anna Catalano</n>.

<n>Noon at the Equator</n> by <n>Germaine Krull</n>, 1928.