THE GEOMETRY OF THE PICTOGRAMS
At this stage it's obvious that the Circle
makers' tools present some restrictions. They can "only"
(!) create shapes that are made of straight lines, circles and
their combinations.
But we who have seen the art of these
beings, know how beautiful and varying patterns can be made
with these simple tools.
Combinations made only of Circles
(the "original" Crop Circles) 
Combinations made of Circles and Rings ("classical"
Pictograms) 
Combinations made of Circles and Paths

Shapes made of sliced Rings

Combinations made of Circles, Rings and Paths 
(note that the paths' endings don't have to be sharp: the
picture in the right)
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