The position of the windmill blades is a code for the farmers bringing in the grain for milling. Blades left in a "T" formation means that the miller is gone for a few day break. Another position means that the miller is gone for longer. Blades left in an X mean that the mill is open and ready for business. Also, for holidays they place different shapes on the blades, for example one for Christmas, one for weddings, draped in black for funerals, etc. Also they can open the fabric on the blades that traps more wind making them more powerful, much as a sailboat does.
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