Bill told me about a French philosopher who remembered his childhood memories by returning to his childhood home, remembering that he ran his finger against the wall, to find that only when he ran his finger against the wall at the height of a 3-year old would the memories return. This ties into the idea of memory involving a dynamic mechanism between essences and their context.
Also thinking about this with regard to optical illusions. Think about this:
The oscillation between essence and context is very vivid here. As we become aware of the context, what was the essence becomes the context and then back again.