The Truth Is Out There, Scully!

This new crop circle appeared last month in a barley field in Oxfordshire, England. One of the largest crop patterns ever, at 200m (that's 600ft.) from top to tail, it's the first time a jellyfish pattern has ever been seen in this kind of field "drawing". There've been butterfly and bird patterns in the past, but this is the first jellyfish crop circle/pattern in the world. At three times the size of most patterns, it has crop circle experts extremely excited.
So...what exactly ARE these patterns? There're at least two theories: theory #1 says crop circle patterns are totally and unmistakably man-made, to attract more tourists to the region during the harvest season (and their appearance certainly does draw viewers). Theory #2 claims the jellyfish is too huge to have been made overnight even by a large group of people, it’s definitely of extraterrestrial nature and a signal from "out there".
If that IS the case, then what kind of signal is it? Can't they just spell "H-E-L-L-O"?
PS: 20 Oct.2009 - Maybe I shouldn't have joked about alien artists!
Check out this story from a cop in Crop Circle Country...