A kotatsu is a low, wooden table frame covered by a futon, or heavy blanket, upon which a table top sits. Underneath is a heat source, often built into the table itself. Kotatsu are used almost exclusively in Japan, although similar devices are used elsewhere.
Kotatsu
![Kotatsu](https://freeyorkk.b-cdn.net/wp-content/uploads/wl/2019/05/Kotatsu-tastefulTN-1150x1481.jpg)