The "cold-toned lines" formed by the dark grey imitation stone bricks spreading out in the snowy scene. The brick surface is covered with the rough texture of the dark brown shale. The various-sized bricks form the rhythm of the wall. The wide bricks resemble the solid cutting surfaces of rock blocks, while the narrow bricks resemble the light and delicate patterns of stone chips. They are spliced together at different angles on the building facade. 

When the snowlight filters through the eaves, the texture of the wide bricks retains a dull, cold tone, while the edges of the narrow bricks spread out with fine snow-colored reflections. Even the brick joints have become lines of light and shadow, weaving a layer of alternating light and dark on the wall surface.