A tension exists between their provisional nature in the processes of design and their residues, survivals or pentimento appearances in the outcome.
Sarlo deftly sketches the various ' pentimentos ' or layerings that have constructed the city since 1890, when it began to emerge from the pampas as a pole of migration and modernity.
There is a pentimento, in which full detail of the face of one of the cheats had been sketched in spite of being painted over by the page's hat.
