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<n>Luzes Relacionais</n> by artist <n>Ernesto Klar</n>.

Diagrams of a <n>Logarithmic Spiral</n>, <n>Fermat's Spiral</n>, <n>Archimedean Spiral</n>, and <n>Hyperbolic Spiral</n>.

Photograph of <n>Adiantum pedatum</n> (1898-1926) by <n>Karl Blossfeldt</n>.

<n>Spiral Jetty after Robert Smithson</n> (1997) by <n>Vik Muniz</n> from his Pictures of Chocolate series.

Photo by <n>Ekaterina Mukhina</n> for the 2016 <n>Junebug Weddings</n> Best of Engagement photo contest.

<n>Cosmic Vortex-16</n> (1966) by artist <n>Hsiao Chin</n>.