When “無” fills a head
Why it is in the set
Because a head that is genuinely empty is a real state and nothing else could say it. There is also a joke buried in the mechanics: the site can tell you that 38 percent of your head is nothing, which is a sentence that should not work and does. It is the only character in the set that contradicts the picture it appears in.
What a head full of it looks like
Staring at the middle distance on a train. Being asked what you are thinking about and having no answer. The blank twenty minutes that turn out to have been forty. A head led by 無 is not troubled. It is simply not running anything.
Words that use it
無い (nai, not existing), 無料 (muryou, free of charge), 無駄 (muda, waste), 無理 (muri, impossible or overdoing it), 無意識 (muishiki, unconscious), 無心 (mushin, a mind free of thought — a term from swordsmanship and Zen).
Kanji it turns up with
休 (rest) behind 無 is a good day. 忙 (busy) behind it is somebody who has run out.
Where “無” comes from
The old form shows a person holding what look like ox tails, dancing. It was borrowed for the sound to mean “not”, and a new character 舞 was made for the dance.
That borrowing is common in the writing system, and it is why so few characters look like what they mean.
As a prefix 無 negates: 無料 (free of charge), 無限 (limitless), 無駄 (wasteful, literally “without use”).
A line you might get for “無”
“Over half of this head is nothing at all, and it is holding firm.”
Count the “無” in your own headOthers in “Getting away”
“無” is filed under “Getting away”. These are the rest of that group.
The 36 kanji
This is entirely a joke and has nothing to do with any real person.