简约渐变风蓝色方块实物商业照片

C4D render, ray tracing, high resolution. A single cube of blue billiard chalk, made of powdery, matte gradient clay. One face is visibly concave from repeated use, with the chalk powder clinging to the edges. It rests alone, a tiny but essential accessory. A focused, precision-tool tilt. Warm, dusty and tip-preparation lighting on pure white background.