Artist on the sidewalk...

He was gathering quite a crowd, some taking a quick look and moving on.  Others lingered to watch the process and progression of this transient work.  I wondered if this was an artist who would create a three-dimensional work, but did not stay to its completion.  Two days later, it was gone.

So, to my French speakers, is this artist "sur" le trottoir?  

Printemps, le trottoir
64, bd Haussmann
75009 Paris