Letter from Vincent van Gogh to Theo van Gogh (June 1881) ...drawing - drawing in perspective, too, for instance, a ... has trouble with his perspective, and I know of no better ...
Letter from Vincent van Gogh to Theo van Gogh (early April 1882) ... was reading a clear book on perspective, Cassange's ... getting depth and the right perspective into a ... brought into perspective this way. And that pollard ...