Reverse hand - Gakkatt

Japanese: 逆勝手 - ギャクガッテ

In this alcove , the main alcove is on the right and the side shelf is on the left.
2. A tea ceremony in which the guest sits to the host's left. Also, the tea ceremony in this case. The placement of the utensils and the method of the tea ceremony are partly reversed. Left-handed. Upside down. ⇔ Main-handed.
3. In Ikebana, this is a flower arrangement where the guest sits on the left side facing the flowers. The flowers are arranged in a seat where the light comes in from the left side. Left side (right side in Ikenobo). ⇔ Main side.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:

１床の間で向かって右に本床、左に床脇棚があるもの。左勝手。⇔本勝手。
２茶の湯で、客が主人の左手に座るかたちの茶席。また、その場合の点前。道具の置き方や、点前の方法が一部逆になる。左勝手。さかがって。⇔本勝手。
３生け花で、客位が花に向かって左側にある花型。光線が左側から入る席で生けられる。左勝手（池坊では右勝手）。⇔本勝手。

出典　小学館デジタル大辞泉について　情報 | 凡例

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