Origami Day.

November 11 is Origami Day. First observed in Japan, the unofficial holiday honors the ancient Japanese art of creating intricate objects and complex shapes out of square pieces of paper.

Origami, which comes from the Japanese words, ori meaning folding, and kami meaning paper, originated in Japan in the 6 century, though for a long period of time the art was preserved for religious ceremonies. By the 17th century, origami had become mainstream in Japanese society and was being used for decorative and ceremonial purposes. In recent years, origami has become popular with origami societies and competitions springing up all around the world.