At the entrance to the architectural garden in the Roshambo Winery along Arnold Road, you can pull off and climb into these enormous chairs. The garden has a $4 admission but there is no charge to enjoy these roadside bottom-resters!
The chair back is about 8 feet above the seat based on my trying to touch the top of it, and it is about 10 feet from arm-to-arm, big enough to rate a wide load flatbed! My guess is it is better than 15 feet tall at the tip but may not reach the 20' mark - tough to gauge on a hillside with distorted sculptures all around it.