At least according to the Twinity Monitor:
What’s that, you say? A pool? Yes, just like you, I didn’t know what to make of his declaration that there was now a swimming pool in Twinity.
But I was in for a surprise. Not only was the pool a usable object (meaning avatars could sit in it), it was filled with rippling, transparent water! As if that wasn’t amazing enough, the pool was located in the middle of a tropical paradise!