Filled Space
Two stretches between three marks: one filled with ticks, one left empty.
这个体验还没有翻译，所以文字仍是英文。
玩法
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Two stretches between three marks: one filled with ticks, one left empty.
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原理 — 建议试过之后再读
Full looks longer than empty
The two stretches are exactly the same length. A stretch divided into many small parts tends to look longer than an empty one, perhaps because there is simply more there to take in along the way.
Johann Joseph Oppel first mentioned it in 1860 and August Kundt studied it systematically in 1863. It is sometimes blamed for why a path with many landmarks feels longer than a bare one.