Ключевые слова: abstract, black white, black and white, blackandwhite, blackwhite, grilles, incidence of light, indoors, inside, interior, light, light incidence, metal grating, monochrome, pattern, shade, shadow, shadowing, stair, stair steps, staircase, stairs, stairway, stairwell, stanchions, step, steps, striped, stripes, sun, sunlight, surface, window, window bars, window grill,