Film noir films were marked visually by expressionistic lighting, deep-focus or depth of field camera work, disorienting visual schemes, jarring editing or juxtaposition of elements, ominous shadows, skewed camera angles (usually vertical or diagonal rather than horizontal), circling cigarette smoke, existential sensibilities, and unbalanced or moody compositions. Settings were often interiors with low-key (or single-source) lighting,
venetian-blinded windows and rooms, and dark, claustrophobic, gloomy appearances. Exteriors were often urban night scenes with deep shadows, wet asphalt, dark alleyways, rain-slicked or mean streets, flashing neon lights, and low key lighting. Story locations were often in murky and dark streets, dimly-lit and low-rent apartments and hotel rooms of big cities, or abandoned warehouses. [Often-times, war-time scarcities were the reason for the reduced budgets and shadowy, stark sets of B-pictures and film noirs.]