http://matthewmattingly.com/sites/default/files/hor-ratio%20instructions%2013.pdf
o is a pocket reference and proportional protractor for artists, designers, art historians, or anyone interested in systems of proportion. It enables the creation, scaling and measurement of rectangular ratios, making it easy to experiment with proportional combinations for new works or to test hypotheses about the composition of existing works.
March 26, 2014
Categories: Graphics, Webdesign
Tags: proportion