Wrote 'Chaos Monkeys' (http://amzn.to/2ow1CHE ). Formerly @facebook, @ycombinator. גם זה יעבור 
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Came upon this weird and enormous sandstone formation in my Sunday hike through Corte de Madera Preserve.pic.twitter.com/5sVEvuupvT
“The Tafoni is a 50-foot monolith that juts up from a forested slope on the edge of a canyon. From 40 yards, the rock looks so out of place that you might wonder where it came from.” It indeed looks like the sacred monolith of some forest cult.https://www.google.com/amp/s/www.sfchronicle.com/sports/amp/What-is-the-Tafoni-You-ll-have-to-hike-to-find-14487605.php …
Looks like an epic climb!
You can find similar formations in the sandstone along the coast below the Chuckanuts, too. Especially at low tide from a kayak
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