Chambered Nautilus (Nautilus Pompilius) The Chambered Nautilus grows larger by a proportion of Phi, this proportion is called the Divine Proportion. It is also known as the Golden Proportion, the Golden Mean and the Golden Ratio. Human fascination with the Divine Proportion is to a great extent due to its many remarkable properties such as harmony, regeneration and balance, to name a few. This piece is framed beautifully with a museum quality frame and measures 50 x 50.