What’s that for?

It’s called bidet and it’s primarily used to wash your privates.
When I was a kid, I didn’t know what that ceramic sculpture-like structure was for. I used to turn it on and imagine it was an outdoor fountain.
Years went by before I found out what it was.
The bidet is a regular fixture in Italian bathrooms. I know that in the United States we are not used to this device, but it makes complete sense when you think about it. Give it a try. You'll feel like the star of one of those "nice and fresh" television commercials.