Figure D - A photograph of a stiff paper grid in the golden proportion for an accurate, but easy evaluation of the golden proportion straight on the upper incisors

From the following article

Aesthetic proportions

E. I. Levin

BDJ 204, 419 - 420 (2008) Published online: 26 April 2008

doi:10.1038/sj.bdj.2008.304

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