Below are pictures of crop circle formations showing Tom Sutter's theory. This is a scan of a polaroid taken at 3500 feet. Unfortunately it was cloudy that day. But I think the formations details can nonetheless be ascertained with ease. Curved lines such as those drawn indicate rotation.
Rotation indicates centrifugal forces.
Note that the 'increments' are aligned and not random. Rotates and harnesses centrifugal forces. Must be affixed onto a rotating shaft. Electromagnetically implodes in increments toward the axis of rotation. All three of these descriptive criteria are located in the centre - Now note the three lines connecting the three formation criteria connecting to the centre of the formation.