Nice, we have a really, really cool Penrose Triangle sculpture near where I live in Perth, Western Australia.

Built in the middle of a round-a-bout, from one angle it just looks like a random sculpture poking this way and that:

But as you continue driving around the round-a-bout, the shape takes form:

Probably one of the most impressive pieces of public art I have ever seen in this city. It's just so damn cool, and a nice little hidden secret for those that know it's there.

(photos not mine)