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©Pat Ashforth & Steve Plummer 2014

©Pat Ashforth & Steve Plummer 2014

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This illusion is designed to be viewed from the side. This photo shows what you see when you look straight at the knitting.

The illusion is based on a red chalk drawing by Leonard da Vinci. It is often referred to as a self-portrait but there is much dispute about this. It seems more likely that it is his father or grandfather. It is our most subtle illusion so far.