The phenomenon happens thanks to the human mind's affinity for Pattern Recognition! Huzzah Pattern Recognition!
Our minds are very, very good at subconsciously examining visual cues and sorting them into something that makes sense (instinctively developed from all those years of picking out the lion in the tall grasses). Just one of the incredible things that make us Earth beings so unique in the universe.
It's also one of the reasons why so many writers need editors, to catch the instances of these that slip into manuscripts.
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