Dot
"Everything starts from a dot." - Wassily Kandinsky
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Mathematically, a dot is a graphical illustration of a nildimensional space (a point).
- That is, you can't see it really.
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However, as a primitive building block of art, it's blob of ink (or any medium) that is small enough for the human eye to perceive as a single point in space (which you can see!).
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Sometimes a dot can be perceived not from explicitly marking a surface with a blob of ink but in relation of two lines. Two lines intersecting can create a dot.
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A row of dots arranged becomes a line when it's close enough for the human eye to not be able to perceive the gap between each successive dot.