Doing seiza is an integral and required part of several traditional Japanese arts, such as certain Japanese martial arts and tea ceremony (a table-style version of tea ceremony known as ryūrei was invented in the 19th century). Seiza is also the traditional way of sitting while doing other arts such as shodō (calligraphy) and ikebana (flower arranging), though with the increasing use of western-style furniture it is not always necessary nowadays.