The use of shading and the projection of shadows to show perspective in architectural or technical drawing.
- These methods differed from contemporary pictorial practices by their greater science - particularly the use of shadow projection (skiagraphy).
- His first process, sciagraphy or photogenic drawing, had been an invention.
Late 16th century: from French sciagraphie, via Latin from Greek skiagraphia, from skia 'shadow'.
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