猫是上楼还是下楼？答案揭晓
<p><span word="On">On</span> <span word="Thursday">Thursday</span>, <span word="a">a</span> <span word="picture">picture</span> <span word="of">of</span> <span word="a">a</span> <span word="cat">cat</span> <span word="walking">walking</span> <span word="on">on</span> <span word="a">a</span> <span word="set">set</span> <span word="of">of</span> <span word="stairs">stairs</span> <span word="started">started</span> <span word="to">to</span> <span word="go">go</span> <span word="viral">viral</span>. <span word="The">The</span> <span word="original">original</span> <span word="post">post</span> <span word="asked">asked</span> <span word="readers">readers</span> <span word="if">if</span> <span word="the">the</span> <span word="cat">cat</span> <span word="was">was</span> <span word="walking">walking</span> <span word="up">up</span> <span word="or">or</span> <span word="down">down</span> <span word="the">the</span> <span word="stairs">stairs</span>.</p><p>4月9日，一张猫咪走楼梯的烧脑神图掀起讨论热潮。发布这张照片的原帖问道：这只猫到底是上楼还是下楼？</p><p><span word="The">The</span> <span word="story">story</span> <span word="has">has</span> <span word="since">since</span> <span word="exploded">exploded</span> <span word="and">and</span> <span word="no">no</span> <span word="one">one</span> <span word="online">online</span> <span word="can">can</span> <span word="agree">agree</span> <span word="if">if</span> <span word="the">the</span> <span word="cat">cat</span> <span word="is">is</span> <span word="running">running</span> <span word="up">up</span> <span word="or">or</span> <span word="down">down</span>. <span word="Commenters">Commenters</span> <span word="in">in</span> <span word="both">both</span> <span word="camps">camps</span> <span word="keep">keep</span> <span word="citing">citing</span> <span word="architectural">architectural</span> <span word="and">and</span> <span word="biological">biological</span> <span word="reasons">reasons</span> <span word="for">for</span> <span word="their">their</span> <span word="conclusion">conclusion</span>.</p><p>随后，这个帖子被疯狂转载，这只猫到底是上楼还是下楼，网上没人能取得一致意见。两大阵营纷纷引用建筑学和生物学知识，不断为他们的结论寻找依据。</p><p><span word="But">But</span> <span word="it">it</span>'<span word="s">s</span> <span word="obvious">obvious</span> <span word="that">that</span> <span word="the">the</span> <span word="cat">cat</span> <span word="is">is</span> <span word="going">going</span> <span word="down">down</span> <span word="the">the</span> <span word="stairs">stairs</span>.</p><p>但显而易见，这只猫是在下楼。</p><p><span word="First">First</span>, <span word="look">look</span> <span word="at">at</span> <span word="the">the</span> <span word="architecture">architecture</span> <span word="of">of</span> <span word="the">the</span> <span word="stairwell">stairwell</span>. <span word="The">The</span> <span word="nose">nose</span> <span word="of">of</span> <span word="the">the</span> <span word="stair">stair</span> <span word="treads">treads</span> <span word="is">is</span> <span word="overhanging">overhanging</span> <span word="the">the</span> <span word="riser">riser</span>, <span word="which">which</span> <span word="has">has</span> <span word="a">a</span> <span word="pebbled">pebbled</span> <span word="texture">texture</span>.</p><p>先来看看楼梯的建造结构。楼梯梯面的收边条伸出了鹅卵石材质的梯级竖板。</p><p><span word="This">This</span> <span word="is">is</span> <span word="what">what</span> <span word="the">the</span> <span word="textured">textured</span> <span word="rise">rise</span> <span word="and">and</span> <span word="stair">stair</span> <span word="nose">nose</span> <span word="might">might</span> <span word="look">look</span> <span word="like">like</span> <span word="in">in</span> <span word="real">real</span> <span word="life">life</span>:</p><p>下图或许可以还原梯级竖板和楼梯收边条在现实中的模样：</p><p><span word="Plus">Plus</span>, <span word="if">if</span> <span word="you">you</span> <span word="look">look</span> <span word="closely">closely</span>, <span word="there">there</span>'<span word="s">s</span> <span word="even">even</span> <span word="a">a</span> <span word="slight">slight</span> <span word="shadow">shadow</span> <span word="under">under</span> <span word="the">the</span> <span word="overhanging">overhanging</span> <span word="nose">nose</span> <span word="of">of</span> <span word="the">the</span> <span word="stair">stair</span> <span word="treads">treads</span>. <span word="These">These</span> <span word="shadows">shadows</span> <span word="would">would</span> <span word="only">only</span> <span word="be">be</span> <span word="visible">visible</span> <span word="if">if</span> <span word="the">the</span> <span word="cat">cat</span> <span word="was">was</span> <span word="going">going</span> <span word="down">down</span> <span word="the">the</span> <span word="stairs">stairs</span> <span word="towards">towards</span> <span word="the">the</span> <span word="viewer">viewer</span> <span word="who">who</span> <span word="is">is</span> <span word="looking">looking</span> <span word="upstairs">upstairs</span>. <span word="The">The</span> <span word="light">light</span> <span word="coming">coming</span> <span word="from">from</span> <span word="the">the</span> <span word="upstairs">upstairs</span> <span word="landing">landing</span> <span word="is">is</span> <span word="causing">causing</span> <span word="the">the</span> <span word="shadow">shadow</span> <span word="of">of</span> <span word="the">the</span> <span word="tread">tread</span> <span word="to">to</span> <span word="fall">fall</span> <span word="on">on</span> <span word="the">the</span> <span word="riser">riser</span>:</p>
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