By John Ballard
I share Ron's nostalgia for slides. I went through my collection a few months ago and discarded hundreds of memories that no one but me would ever appreciate, but the scores I kept will make any archivist from the future jealous. I have a large screen in the basement and an old slide projector, a Rube Goldberg arrangement by which I capture the images on a modern digital camera. Last year I finally retired my old Nikon F Photomic T which served me well more than forty years.
Meantime, I just came across one of the prettiest online slide shows I have ever seen, a National Geographic photo-essay on a cave in Vietnam. Nieteen or twenty spectacular slides, including this, a phenomenon I never knew about.
Rare cave pearls fill dried-out terrace pools near the Garden of Edam in Hang Son Doong. This unusually large collection of stone spheres formed drip by drip over the centuries as calcite crystals left behind by water layered themselves around grains of sand, enlarging over time.
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