A modern ancient art

Rome has many modern examples of a very ancient art; graffiti. I have no idea what this is all about:

He’s got the lace of a Nike trainer in a fork as if it’s spaghetti. Is he Charlie Chaplin?

This one has some other obvious symbols:

All I can say is what a beautiful set of petals.

Much of the best work is paper art posted like posters on the walls. This pair of hands are lovingly posed, posted over earlier spray-can tagging.

What does it all mean?