Hi Akira, the angel is a flat 2D picture (a quality one), while the workers are hand drawn, the whole thing is screwed to the fence...
I'll show some others in a few days, as the wooden fence itself is an allusion to the museum as most fences today (for works) are metallic !
It's like a comic strip all along the fence showing some of the artifacts we have in that museum that sits in the Roman Thermes of Lutèce (Paris in Roman times) plus some late additions circa 1200 AD. Today there is a great refurbishment of the whole museum, opening rooms under the Boulevard St Michel and playing with a small middle-age garden and a chapel, thus the need for a high fence...