Walter Percy Day

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Walter Percy Day O.B.E. (1878–1965) was a British painter best remembered for his work as a matte artist and special effects technician in the film industry. Professional names include W. Percy Day; Percy Day; "Pop" or "Poppa" Day, owing to his collaboration with sons Arthur George Day (1909–1952) draughtsman, Thomas Sydney Day (1912–1985), stills photographer and cameraman, and stepson, Peter Ellenshaw, who also worked in this field.