(3) Kinds of lines While the shape of points is called "the shape of points", that of
lines is called "the shape of lines", and the shape which has expanse is
called "the shape of planes", there are divisions of straight lines and
curve lines as referring to the shape of lines; it is useful to divide
the latter into open curve lines and close curve lines. Straight lines
can be, as in mathematics, considered that the curve ratio decreases infinitely,
but in formative arts, its quantity is very different from a curve line,
it should be divided on the divisions. On the contrary to a free handed
line, a geometrical line has a shape and an organized sense.
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