[shermantanktop]

The Puget Sound ferries often have a partially-done jigsaw puzzle on one of the tables. You can't finish it in 30m, so people come and do their part and move on. Eventually someone will put in the last piece, I guess, I've never seen it happen.

[runarberg]

I love those. I have finished one (well it was missing a couple of pieces), between West-Seattle and Vashon, and what was better was that I contributed to the puzzle earlier on the way from Vashon.

[rmunn]

My last visit to Seattle was in 1998 so I can't confirm this firsthand, but I would bet that when someone finishes the jigsaw, ferry staff bring out a new one.

[runarberg]

Usually somebody just scrambles it again, but they are regularly rotated. I don’t have a precise measure, but I would guess every couple of weeks or so.