Kotatsu - Wikipedia
https://en.m.wikipedia.org/wiki/Kotatsu
WEBA kotatsu (Japanese: 炬燵 or こたつ) is a low, wooden table frame covered by a futon, or heavy blanket, upon which a table top sits. Underneath is a heat source, formerly a charcoal brazier but now electric , often built into the table itself. [1]
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