Kotatsu is a heating appliance used in Japan.
Use a table with a top and a leg separate, cover the blanket over the legs, and cover the top with the blanket.
There is an electric heater in the inside, and it is very warm when you enter the inside.
There is usually one in each house in Japan, and covering the bed with kotatsu is the sound of winter. There are various shapes such as square, rectangle, ellipse, circle.
It is the Muromachi period that first appeared on the record.
Kotatsu at this time, of course, because there was no electricity in the form of a charcoal on the inside, and the middle of the charcoal fire from the top of the tea was concerned that he was able to drink.
Some of the houses where kotatsu is set can be lowered as if the bottom part of the kotatsu is sitting on a dented chair, which is a sign of the way of using charcoal in the past.
Electric kotatsu began to be produced in the 1970s.
Previously, when I was warming up with briquettes, gas inside the kotatsu caused frequent briquette gas poisoning accidents.
It is really hard to get out once you enter. This is because the temperature of inside and outside of Kotatsu is very different because Japanese houses are very weak in heat insulation compared to Korea and Western houses.
This is because Japanese houses are not only traditional and modern, but they are designed to win the summer heat of high temperature and humidity.
Some kotatsu can be used as a mahjong plate if you turn over the top cover.