OPTICS - PERFORATED VIEWS - A collection of 21 (optical) views drawn and watercoloured on paper (mounted on wooden frames). 19th century. Titles: Galeria en VINCSTER, Entrada de Oporto (PORTO), VIENA (Austria) Gruta de los Jigantes, La avanzada francesa a los Juaris en MONTREAL, Exsterior e interior del Bosque de TRENTO (ROMA), Bosque en BREST, POMPEÏ (Vesuvius), Monasterio de Castello (Roma), Plaza de NEVSTON (LONDON), MEJICO (Mexico) Palacio Antiguo (Brest), GENOVA (Genoa), FERRARA (Italy), Cercanias de BRUSELAS, Cramo, Torrente en FIGUERAS, Sementerio de PISSA, Yncendo del Vapor MISSISSIPI, KIEL, Lago MAYOR de VENEZIA, Mainz Castillo feudal (Austria), Ciudad de LAS PALMAS (CANARIES) Pico de TENERIFE. These watercolours have the particularity of being perforated and can thus be illuminated alternately on both sides of the image to create an effect of passage from day to night. Some are painted on the reverse side to create an illusion by making other figures appear when the lighting changes from facial to back lighting. Approximately 25 x 32 cm each. Condition B/C (Tears and/or stains for some, a few frames weakened, dusty, as is...)