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In the following [example](https://mojim.com/jpy111003x6x2.htm), it remains
unclear to me why the term もの is written in hiragana.

> あの真っ黒なものは何

Here is a second [example](https://mojim.com/twy100852x45x4.htm), where 優しい is
written in hiragana.

> とてもあの人はやさしい

My suppositions:

  * For optical reasons, some kanji are written in hiragana to obtain the desired verse length.
  * Hiragana writing is used to let an open interpretation to the reader (for example 物 or 者, whether this is an object or a person)
  * Too complex kanji are replaced by hiragana to match the target audience (seems not to be the case here since the above kanji are "simple" ones)

Is one of these suppositions correct? Or is there any general rule for this?
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2016-03-27T22:30:09.253
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2016-03-27T22:48:08.803
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question
kanji hiragana homophonic-kanji
Why write「もの」instead of 「物」 or 「者」?
According to Alexander Wurdow (a kind of notable author in Russia), "者/物
usually plays an auxiliary role (nominalization), and therefore most of the
time it is written in kana". Does that make any sense? It's hard to translate
grammatical terms for me...
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2016-03-28T00:46:06.550
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2016-03-28T00:46:06.550
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answer