Nebuta Matsuri in Aomori

This info is from the Aomori city web site:
Origin and development of Nebuta
There are many theories about the origin of the Nebuta Festival. One is that it is said to have originated after the subjugation of rebels in this district by "General TAMURAMARO" in the early 800's. He had his army create large creatures, called "Nebuta", for frighten the enemy.Another theory is that the Nebuta Festival was a development of the "TANABATA" festival in China. One of the customs during this festival was "TORO" floating. A "toro" is a wooden frame box wrapped with Japanese paper. The Japanese light a candle inside the "TORO" and put it out to float onto the river or into the sea. The purpose behind this is to purify themselves and send the evil spirits out to sea. "TORO" floating is still one of the most impressive and beautiful sights during the summer nights of the Japanese festivals. On the final night, "toro" floating in accompanied by a large display of colorful fireworks. This is said to be the origin of the Nebuta Festival. Gradually these floats grew in size, as did the festivities, until they are the large size they are now.Today the Nebuta floats are made of a wood base, carefully covered with this same Japanese paper, beautifully clolred, and lighted from the inner part with hundreds of light bulbs. In early August the colorful floats are pulled through the streets accompanied by people dancing in native Nebuta costumes, playing tunes on flutes and drums.Many Aomori citizens are involved in the building of these beautiful floats. The Nebuta designers create their designs, patterned after historical people or themes. Development of themes takes place immediately after the previous year's festivities come to a close. Consequently, it takes the entire year, first in the development, then in the construction of the Nebuta float.