What do you think? Modern art? Giant Shell no pest strips?
Actually neither. These hanging objects are intended as housing for sparrows, part of a project by the city of Paris to protect the little birds. Their numbers have gone down by about 20 percent in recent years (not as bad as London and Amsterdam where they've all but disappeared) but still enough to take measures. I took this photo less than a month ago when the trees had not yet leafed out. Time flies like a....sparrow!