April 23, 2002—The white lines on the finished concrete shell are patches meant to smooth out imperfections on the stem wall after the plywood form was removed.
Image by Dave South
Sourced from Monolithic Commons
Posted to Avalon High School Gymnasium Construction Photo Journal
CC BY-SA 4.0
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Image by Dave South from Monolithic Commons via Monolithic Dome Institute (CC BY-SA 4.0)