Sidewalk insolvency

At first glance this work in progress outside the Shojikiya building brightens up a dull facade. But as I often do, I've had second (or more!) thoughts. Color paint purposely spilling all over the sidewalk, into the storm drains, into the watershed. But then again, I'm sure the artists were considerate and used non-toxic, zero-impact materials that will easily scrub off the sidewalk and pose no harm to the waterways...right?