Introducing Japanese Things

Please introduce Japanese customs, food and people.

Do you know Japanese "kotatsu" heater? "Kotatsu is a kind of heater. It is like a very low small table. We sit on tatami mat and get our legs in the kotatsu to keep our body warm. Kotatsu table has a heater, which is under the table. The heater uses red rays. I have never seen this "kotatsu" heater in other countries.