心
kokoro
Worry, relief, and downtown all share one character
The picture A lump sits at the center of the chest, beating without rest, and keeps the person moving. 心 is the inside that beats at the center and moves you; 体 is the outside it moves.
Where the picture shows up in 心
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the inside pulled several ways
娘のことが心配です。
musume no koto ga shinpai desu
I'm worried about my daughter.
Threads run out of the lump in the chest and get tugged toward places you cannot see
心配 pictures the heart being parceled out and delivered in several directions.
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the inside settling back down
連絡をもらって安心しました。
renraku o moratte anshin shimashita
I was relieved to get your message.
The lump that was jumping in the chest slowly sinks and comes to a stop
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the middle of a place
駅は町の中心にあります。
eki wa machi no chūshin ni arimasu
The station is in the middle of town.
A finger lands on the exact center of a town map, with roads running out from that dot
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the beating organ itself
明日、心臓の検査があります。
asu, shinzō no kensa ga arimasu
I have a heart examination tomorrow.
Wires on a chest draw a jagged line across a screen, over and over
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the inside heated up
新しい人は熱心に働きます。
atarashii hito wa nesshin ni hatarakimasu
The new hire works hard.
The lump in the chest glows red and the hands keep moving without a pause
熱心 is a 'hot heart': eagerness drawn as temperature.
All of it in one picture
心 is one lump beating at the center of the chest. Let it be parceled out in several directions and you get 心配, worry; let it settle back down in place and you get 安心, relief. Mark that center on a town instead of a body and you get 中心, downtown; point at the organ itself and you get 心臓, the heart; heat the lump up and you get 熱心, working eagerly. The character always points at the thing beating in the middle.