Not my doing, either, and I would say ignorant rather than whimsical, based on the many poor choices the previous owners made!
I’m not sure of the brand name of the spray foam. I could try to look it up, if you’d like. The workman cut 2" diameter holes in the drywall at about 2-3’ intervals and pumped the foam in very quickly and at a decent price. That made it relatively easy to patch and repaint afterward (reusing the cut-out circles).
