Here a video clip with kids running through the pool
Here the sculpture "spits" water into the pool
and one showing a different display
The photo below is taken against the bright sky and lets you see some of the support construction
And a couple more photos
And an artsy shot
And a last photo showing the pool edge in detail - click on photo if you want to see it up closer.
For all photos and videos above: @2010 wild-design.com
I wasn't there at night but thought it might look cool in the dark.
And indeed check out the photos in this blog:
the results of Google image research "Crown fountain at night"
Here some background info from Chicago traveler
At the southwest corner of the park (Michigan Avenue and Monroe Street) are twin 50-foot fountain towers. In addition to the cascading water, the towers display video images of various Chicagoans and lights. On warm summer days, children (as well as youthful- spirited adults) frolic in the shallow water between the two towers and delight in the spray from the fountains. The surrounding green area is a relaxing place to spread out on a blanket and read a book.
or go to Wikipedia's site for more details on this water-sculpture.