Mural or Graffiti?

I'm pretty sure it's a mural, but what is the difference? (One guess what Street this is on.)


Clinton Street in Manhattan just south of Houston.

Here is a former student's tag I just found at a train station. This definitely isn't a mural, but it definitely is graffiti. It's not art, but some of the other tag-work he has done is...it's sad when he just defaces surfaces with crap.


I'll take a cheesy mural any day.