It seems that the reversal is occasionally observed.
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Contrast polarities of line segments are not essential. Columns (a) appear to be convex whereas columns (b) to be concave, though the luminance gradient of the former is just the mirror image of that of the latter.pic.twitter.com/tpJbWDBtD6
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It seems that the reversal is occasionally observed, too.
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With labels to L or R, smooth curves but reverses. Labels up, holds previous direction. Labels down, no curves, zigzag with angles between labels.
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