The pianos trigger spontaneous dancing and draw inspiration. A Seattle woman wrote her own song to play in public.
"It's a piece of furniture that people can gather around and have conversation with. You can get two people playing a piano as well and that's really wonderful," Jerram said.
Those pieces of furniture are art themselves, donated by local artists. When the installation shuts down, the pianos will go to local schools and community centers.
"I'm very proud of this artwork and I hope the public enjoys their pianos," Jerram said. "The project belongs to the people of New York now."
Luke said that 40 cities this week alone have asked him to bring his vision to them.
Christine Brozyna contributed to this report.