Don't understand "set to circle"

Hello,

in draw there are the tools "set to circle
(perspective)" (=
uno.CrookRotate) and "set to circle (slant) (=
uno.CrookSlant). I do not
understand, what these tools should do.

I have made an example file
http://www.rhenschel.homepage.t-online.de/set_to_circ
le.odg

On the first and second page I applied the tools to a
picture which was
transformed to bézier curve. The results seems clear to me,
but I'm not
sure.
On the third and forth page I applied the tools to a group
of lines,
which was transformed to bézier curve to. There I do not
understand the
results.

kind regards
Regina

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