I am drawn to organic abstracts--the forms, shapes and patterns of our natural world, and nowhere are these features better exemplified than at the travertine terraces of Pamukkale. Meaning "cotton castle" in Turkish, Pamukkale is an area is famous for a carbonate mineral left by the flowing of thermal spring water. The Turkish name refers to the surface of the shimmering, snow-white limestone, shaped over millennia by calcite-rich springs. Dripping slowly down the mountainside, mineral-rich waters collect in and cascade down the mineral terraces, into pools below, leaving in their wake a kaleidoscope of patterns. Photo © copyright by Brian Divelbiss.