Have aliens left another calling card?

Conspiracists and Brits are all atwitter about a crop circle that appeared at an Oxfordshire barley field. Instead of circles, the creators have become far more artistic (or they've figured out how to use Earth landmowers). The "circle" is in the shape of a 600-foot jellyfish a first, as far as we know and the BBC has posted an aerial video of the creature.

The overnight sensation launched Web searches for "jellyfish crop circle," "crop circles aliens," "crop circles conspiracies," and for the DIY crowd "crop circle patterns." Previous lawn artworks have appeared in the form of birds, butterflies, and, last year, the first 10 digits of pi (you know, 3.141592654).

OK, say this grassy rendering isn't an alien self-portrait. Even so, the massive carve-out is impressive. Karen Alexander, a croppy (the name for experts in this, er, field), says this one's "absolutely huge roughly three times bigger than...most crop patterns, and extremely interesting. People have been aghast at the size of it. It is a complete monster."