For a  period of 10 years in the late 1980s and early 1990s, more or less, I had this interesting past-time where I would draw on chalkboards for a family of Microbrew Pubs in the Pacific Northwest... the Portland Oregon metro-region to be more precise... the McMenamins. 

I always referred to it as disposable art. I would keep it there for a few weeks and then erase it and start again. This is only a small selection of the drawings I did, because I often failed to document them via camera.  In my humble opinion, the work did get better over the years.