It was a vigorous drawing of a Wren firing an Oerlikon at an aeroplane flying very low towards her. The drawing was in sepia crayon. The Wren was a broad-shouldered, dark-haired girl, hatless, leaning back upon the strap that held her in the shoulder rings, tense, unsmiling, intent upon the sights.
—Quotation from Requiem for a Wren, by Nevil Shute, 1955.
I created the arty effect by using the IrfanView program, available free of charge for private use. I recommend it.