Class Generated Parametric Curves

Knot
 Periodic.
Box
 Periodic.
Butterfly
 Periodic.
Knot2
 Periodic.
TwistTan
 "Periodic".
Box2
 Periodic.
Twisting
 Non-periodic
TwistingLine
 Non-periodic, but repeating picture.
TwistingLine
 Non-periodic, but repeating picture.