In the beginning, the designs were simple, but they grew more complex over the years. The designs are best viewed from a 22 meter tall tower next to the field. In recent years, they have attracted hundreds of thousands of visitors to the village each year.
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The satellite photo does not do this justice. Examples of this amazing work can be seen in the Wikipedia link below.
http://www.flickr.com/photos/glenn-in-japan/6014299177/