Relating to or produced by actinautography, a photographic or image-making process involving the direct action of light rays on a photosensitive surface.
From Greek aktis meaning 'ray,' Latin auto meaning 'self,' and graphia meaning 'writing' or 'recording'; literally 'self-writing by light rays,' a process for creating images.
Actinautography was an early form of photographic technique that used light itself to directly write or record images without a camera lens—it's an ancestor of modern photography and shows how light can be a writing instrument!
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