Observation Five · 5 pieces
On this side there are lines where we decided that beyond here it is different.
A gate. A crease in paper. An island's shore. A line drawn in sand.
On that side the line was not drawn.
Join the places of equal height and it happens by itself.
The line is not there because it was drawn.
It looks like a line because something changes there.
Lightning alone draws no line.
It crosses in one go.
「関係を減らす」を押すと、点が間引かれます。 四万・六百・四十・一つ、と四段あります。 数が減っても走っている式は同じです。消えるのは形だけです。