what's this

[totient]

What's this? And what's so interesting about it, anyway?

Answer in the comments.

Comments

[ceo]

Pinopolis Locks. It's the highest single-stage lock in the US and second-highest in the world, at 75 feet.

[palmwiz.livejournal.com]

Yes, precisely. It's hard to imagine how such a thing could be structurally sound... although the evidence seems to be that maybe it's actually not.