This tide indicator exhibit is designed by my old pal and longtime Exploratorium collaborator, Jesse Marsh. I went up to San Francisco to help prototype these with Jesse in February. I cut a lot of King Starboard (marine plastic) on the CNC machine, and then bolted all the parts together and slipped over the pilings. Then me, Matty and J banged out thirteen more and installed them in the Bay just in time for the opening of the new museum.