Why did a fangding vessel have four legs?

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In the context of Chinese bronzes, the fangding is a square-shaped vessel that stands on four legs. While round-bodied vessels like the li typically feature three legs, the square-section design of the fangding necessitates four legs to support its shape.1

These square-section vessels are believed to derive from boxes, baskets, or containers originally made of carved wood or bone, rather than the pottery prototypes that influenced the shapes of round-bodied vessels.1