Five years ago I was in my local vintage vinyl and music memorabilia store, Gold Million in Bryn Mawr (PA) (http://goldmillionrecords.com), which was hosting an exhibit of work by Cal Schenkel (http://www.ralf.com).
Frank Zappa fans will know Cal as the artist responsible for many Zappa/Mothers album covers, including Cruising with Reuben and the Jets:
