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Cleaning a horn coral from Fossil & Prairie Park Preserve, Rockford, Iowa, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Ripples reflecting off rocks along Chippewa River in October, Sylvan Solace Preserve, Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

plants in the Hortus Botanicus, Leiden

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

plants in the Hortus Botanicus, Leiden

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Port Coquitlam, BC, Canada

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate boxwork in Wind Cave, a cave formation found here more than anywhere else, Wind Cave National Park, South Dakota, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Intricate ice crystals growing on a window pane in winter in Michigan, USA

Colorful river-polished stones in Dosewallips River Valley, Olympic National Forest, Washington State, USA

plants in the Hortus Botanicus, Leiden

plants in the Hortus Botanicus, Leiden

Ripples catching sunlight on the surface of Mitchell Creek, Clay Cliffs Nature Area in Big Rapids, Michigan, USA