(ii) Flipping There is a distinction between stringed instruments
and percussion instruments in music. When we also try to distinguish the
tool of modeling by the methods of modeling, there are many kinds of so-called
writing materials which "draw" on a sheet of paper such as brushes and
ball-point pens. Though unexpectedly there are not many tools which corresponds
to the percussion instruments. The India ink bottle used by carpenters
(Sumitsubo in Japanese), which is used to draw lines by flipping a string
with India ink, may be a unique example of this. Lines drawn with writing
tools are continuous. On the contrary, when the string is flipped, the
ink is splashed onto a piece of paper in the form of extremely small points.
Thus, the lines are not always continuous. Although a line looks continuous
to our eyes, only assemblies of points are observed using a magnifying
glass. A part of the line is not continuous where the density of the points
is small.
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