Summary

  砂の上に描かれた幾何学模様．

Reference

  Phidelity.com - Cropless Crop Circles
  http://www.phidelity.com/cms2/?option=com_content&task=view&id=40&Itemid=85
  Phidelity.com - Cropless Crop Circles - Photos of All our Sand Circles
  http://www.phidelity.com/cms2/?set_albumName=2005&option=com_gallery&Itemid=72&include=view_album.php

via

  ひろぶろ - 2005-03-25
  http://blog.livedoor.jp/stardom/archives/17196402.html