"It's kind of a mind jog. And at my age my mind needs all the jogs I can get," said one Chicagoan.
Is it art? Is it sculpture?
"It is art," said another.
"Not really, not really," said a third Chicagoan.
"I like it. I could play basketball with this," said a fourth.
The man behind the RedBall Project -- which has been travelling the world since 2001 -- uses the red ball as his paint brush and local architecture as his canvas. He mixes them together to capture our imagination.
"We're moving between places like this ... like a really beautiful, classic piece of sculpture to other sites. We're going to go to Bucktown and North Avenue Beach," said Perschke.
Red ball began its Chicago visit in Millennium Park on September first. It will continue its tour until September 25th at the Chicago Cultural Center.
Put together like those big rubber rafts, the ball is 15-feet and 250 pounds. It's inflated every morning by a power blower.
To some, it's just a ball. To others, it's art.
"For me it's art because we take a peek at the city a piece of the city the people know so well and even if just for a moment see something new in it," said Perschke.
Either way you look at it- the red ball is something to bounce ideas off.