Dear You,
you know by now that I have an eye for little things - and being (part-)eidetic, I do not forget pictures (nor faces, even when they have aged during years-long absence).
So when I spent a few weeks in London in August 2014, I walked over the Millenium Bridge, and run with the hustling stream of visitors. Then I stopped, several times, seeing tiny drawings at my feet (or under the feet of others - people just don't look), very colourful and a bit naive, like little graffiti. Of course I took photographs (not that easy - I could not get sharper ones), and when I tried to find out what they are, no one could tell me (might have asked the wrong people in Tate Modern?)
Now I think the riddle is solved: I looked into facebook today and saw a photo in The Londonist and thought: that must be him - the creator of these tiny images!
Artist Ben Wilson draws his miniatures on chewing gum that other people carelessly spit out on the pavement - and in a BBC interview (at the end of my letter) I found this sentence most impressing: "Not making to many judgments - just seeing what we can make out of it". (OWTTE)
http://cdn.londonist.com/wp-content/uploads/2015/01/Chewing-gum.jpg
Here is the link to the BBC film:
http://www.bbc.co.uk/news/entertainment-arts-11677462
So I am content that I stayed on facebook (though I drastically reduced the time I spend there to 10 minutes a day).
And happy to have one answer (of many) solved.
Yours
Britta