The word "phantom" may or may not be used in front of these concepts.
In the Overlapped Diamonds concept, people in an actual line imagine that they
are centers or points of a diamond, with phantoms in the other spots. Centers
of the line become centers of the diamond, with phantom points perpendicular
to the line. Ends of the line similarly become points of the diamond.
\phfour{b2s,g2n,g1s,b1n}
\pvdiamond{g2e,b2n,g1w,b1s}
before Overlapped Diamonds Cut the Diamond
after
The Overlapped Lines concept is similar. People in a diamond imagine that
they are in lines.
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