Charcoal is a limited drawing medium (like pencil) because you can only create artforms in a Monochromatic scale - Black (your charcoal medium) to white (or whatever color your canvas is). It has a single color value and is irreversible once used.
The answer is flickering streetlights or light through a window. Film noir is based on mood of pessimism, fatalism, and menace. It is also originally applied on American thriller films and detective films. So, flickering street lights or light through a window explains that the best.
In the film Amelie, Amelie meets an old painter who never leaves his house they call him the Glass Man (real name: Raymond Dufayel)
The house is a single-family residence. Complexity ranges from rudimentary huts to complex structures made of wood, masonry, concrete, or other materials with plumbing, electricity, heating, ventilation, and air conditioning systems[1][2 ]. Various roofing systems are used in homes to prevent rain and other precipitation from entering living spaces.
The house may have doors and locks to secure living space and protect occupants and contents from intruders and other unauthorized persons. Most conventional modern homes in Western culture have one or more bedrooms and bathrooms, a kitchen or cooking area, and a living room. A home may have a separate dining room, or the dining area may be integrated into another room.
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