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The defining feature is that the quadrupole convolution passes through zero in the upper-left and lower left parts of the figure. Therefore, by objective standards, this is indeed the letter “D”. The defining features in this character, which cause both humans and quadrupole convolution to define this character as “D”, are the serifs. Serifs are conventionally defined as inhabiting the ends of strokes, but these serifs are not on the ends of anything. Yet they serve their purpose, both for humans and for quadrupole convolution. |
Serifs are enormously popular in our society. This web page is programmed to display in a font that you choose. Almost certainly, in this brief text, there are more than a thousand serifs on your screen at this moment. Both human vision and quadrupole convolution respond well to serifs. This observation suggests that quadrupole convolution may be an important component of human vision.
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