(CBS) -- Every year about 65,000 people visit the corn maze at Richardson Farm in Spring Grove, Illinois. The owners say it's the most detailed and complicated pedestrian puzzle in the world.
For the past 13 years the Richardson family has created mazes on their 28-acre corn farm. The family comes up with a theme, and it's passed along to a maze expert from Idaho, Shawn Stolworthy, who comes to town with a tractor, a GPS, and a vision.
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A tractor cuts through rows of sterile corn, which is softer than normal corn -- a good thing, because the Richardsons say some patrons like to throw ears at each other.
Referring to the pattern on a computer as a guide, a tractor driver cuts the corn maze in the spring, when the corn stalks are short and stubby.
By the fall the un-felled corn stalks have risen as high as an elephant's eye -- making navigation of the maze difficult for anyone under NBA height.
Every season has a theme, and this year it's The Beatles ... John, Paul, George and Ringo embedded in the field 50 years after their American debut.
Visitors are provided with a map. We're told by informed sources that navigating Paul's ear can be especially tricky.