1.618 is the number related to the "Golden Ratio". 

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The artist has been directly exploring the Golden Ratio in his work for several years in both painting and the interactive sculpture "You Are Worth More Than Your Weight in Gold"

 

Endearingly called "The WiG" by the artist.

 

In this series the artist uses the Fibonacci ratio to divide the background (which directly relates to the Golden Ratio), where his figures inhabit.