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lid (radical)
LIDS are designed to fit into pots and pans to keep heat and moisture in, they are straight lines with a handle (to protect from the heat) because if they overlapped with down edges, water from steam would drip out.
CROWNS and ROOFS are designed to fit onto heads and houses; they need down edges for a better fit (and to keep water out?).
ROOFS (not CROWNS)also need a chimney to let smoke out.
by
ElaineCampbell