Something about palimpsests teases the imagination, with artists and observers discovering and creating them in different media. Following are palimpsests created by artists and by time itself.
Traditionally, palimpsests are defined as manuscripts erased and written over. The purpose was to conserve materials, not to censor. The original words, and sometimes images, were physically scraped from the surface of parchment or vellum. Later, chemical erasure was used. Nova/PBS gives a quick introduction here.
My review of The Lost Diary of Venice, by Margaux DeRoux, is posted at Historical Novel Society. The novel’s dual plot revolves around a palimpsest from Renaissance Venice.
Maybe recycling creates palimpsests, as new uses layer over old. Nineteenth-century recycling here.