Fountain

I've been walking at lunch time these days, along a "street park" in front of my ofice. Last week, I noticed they dug a huge rectangular hole about 4 or 5 feet deep, lined with concrete. I thought, this must be a fountain, although it seemed pretty deep for a fountain. Over the next couple of days, they filled in the "pool" with a steel lattice work, completely baffling me. I was about to give up on my guess that this was a fountain, when suddenly they posted this large sign. It will indeed be a fountain, completely with a light show!