Besides auto places, other kinds of establishments are frequently sites of public art — convenience stores, tattoo parlors, barber shops, and new to the list, vape stores. The Vape USA store just south of Grassmere on Nolenseville Pike (not to be confused with the Vape USA store a couple miles north on Nolenseville) is a good example. Not sure about signatures. Most of the text seems to refer to vaping products, though “P1107” is a mystery to me.
Located at 3807 Nolenseville Pike, a few hundred yards south of the entrance to the Nashville Zoo at Grassmere. Plenty of parking. Not a vaper myself, so I can’t vouch for the merchandise!