Permanent Seating

Outside a public building in Menlo Park, CA, I saw several of these objects bolted to the wall.

Permanant-Seating-1

There were about eight of these in a row and at one end, a portable toilet.

Permanant-Seating-2

The flat panels rotate to make a seat for those folks waiting in line to use the toilet!

Permanant-Seating-3

An interesting combination of permanent seating with a temporary toilet.

Why do you suppose the seat platforms rotate from vertical to horizontal? A few ideas are (a) to speed drying after the seats get rained on (b) to avoid people leaving trash on the seats (c) any other ideas?