Palimpsest
A palimpsest is a manuscript page from a scroll or book from which the text has been scraped off and which can be used again.
Georgian Palimpsest (top) and a design Development Drawing
This concept is used in the discussion of architecture, where layers of different ages can be seen in the same building.
I have adopted this concept when designing both buildings and paintings. Typically I do not use and eraser, but continue to draw darker. This helps develop an overlapping of shapes and meaning which become more and more interrelated.
La Verguensa 
Hi Sam, Might it be possible to use the Development Drawing image to accompany a poem about architectural palimpsests, in a video, with attribution? This would be amazing.
Yes Celina. I am not sure which image you are referring too. I sent you an email. Call me. And I will review my blog. Palimpsests play a big role in my work both Architectural and Painting. I will also float around your web page. Good luck. And thanks for asking for permission.
Sam