Paying one's respects to a departed artist

Robert Rauschenberg, recently deceased, is one of the great American Modern artists of our time. Within the medium of which we view his art, in museums, galleries, etc. it would not be appropriate to pay our respects like one would do so in the streets. Say when John Lennon, and Kurt Cobain died, there were public vigils, candles lit, flowers, pictures and memorials laid out.
In a museum if you lay anything before a piece or try to slip a note underneath, you'd be hauled and and charged with vandalism.
So today, I propose a new tribute. If you are in proximity to an artist's works, as I was today, write him a little note, like so:

Respect.