Now - light where it exists - can exert an action, and in certain circumstances does exert one sufficient to cause changes in material bodies. Fox Talbot 1834

Light for Aristotle was " the actualization of the potentially transparent".

Photo-syn-thesis involved masking off areas of Bromeliad plants and exposing them for months to sunlight which created bionically imprinted symbols on the living tissue of the leaves - The Biotic Images eventually fade over time or die with the parent plant, but,survive as C-Type and or Pigment Prints