As the foundation of any architectural design, sketches and drawings have long been known for their ability to allow the architect to interact with his/her design efficiently and express concepts ...
A free drawing application that allows easy sketching and memo writing on the iPad is "Paper by FiftyThree". It is highly appreciated at the App Store for ease of drawing that is unlikely to be free.
Perspective drawing of the Lower Manhattan Expressway / City Corridor project (unbuilt), New York ca. 1967–72. The Museum of Modern Art, New York, Gift of the Howard Gilman Foundation (1290.2000).
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