Palimpsest

The eraser you lent me doesn't work very well, which combined with my perfectionism led to my sketch looking like a palimpsest.

But on her he did not see even the palimpsest of a smile.

Miraculously, the Stasi's record of Garton Ash's years in Berlin remained intact, and in his extraordinary book The File he recalls going back to Berlin, sifting through the material, and piecing together those years for himself. The result is a palimpsest of memories, observations recorded by informants and agents, and the recollections in his own diaries at that time.

... with the multilingual portmanteau words and phrases giving the text the quality of a palimpsest upon which multiple layers of textual meaning can be simultaneously detected.

Typically refers to a multi-layered work, e.g.: new ads covering old on a roadside sign.