Antiparallelogram
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An antiparallelogram is a geometrical figure with four sides, whose pairs of nonadjacent sides are the same length but in which two opposite sides intersect (unlike for a parallelogram) hence are not parallel.
If the lengths at the neighbouring sides are antiparallelograms stand in this root 
and if one holds one of the neighboring sides, then the centre of the opposite sides are a Bernouillian lemniscate.
An antiparallelogram can be developed as a mechanical construction with joints and the terminator points of these straight lines. so these straight lines can be converted into a circular.
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