Who are the circle makers?

I was asked by a subscriber if I could bring the collective forward for their responses on Crop Circles. How are they made? And for what purpose?
The collective come forward with their response saying that Crop Circles are made by the Circle makers? Who, exactly, are the Circle makers?

Edited by MagentaPixie
Music "Eternal Hope" by Kevin Macleod.

Originally uploaded July 4th 2008