The line 丨 in the middle of the square 口 shows to the middle.

Left: metal 钅(=金 Covered in the ground 土 are 2 gold nuggets 丷), right: center/middle 中 (here: Top view of a bell 口 mounted on an axle丨)
Made of metal and mounted on an axle is: the bell.

Left: rice plant 禾 and: 'middle/center' 中
The rice plant comes from the center (land of the middle = China), where it was cultivated.

冲 was traditionally: 沖 with water 氵that was poured into a middle 中
Put ice (traditionally: water) into the middle for rinsing or to rush forward.

Developed from the image of an insect with sting (cf. scorpion 禺)
In the middle 中 of the earth (bottom stroke) are insects and worms.

Left: movement 辶, right from top: center 中, one 一, buttocks
Move one buttock from the center, I want to dispatch him.

Left: body part 月/肉, right: center 中
At a body part it forms a 'middle': A swelling.

Top: center 中, below: heart 心
In the middle of the heart is the loyality.

Center: middle 中, rest: clothing 衣
In the middle of the clothes she hides her inner feelings.

Left: person 人, right: middle/center 中
The person in the middle is (by age) the second (of the brothers).

Left: feelings 忄, right: center 中
The feeling out of your center is: grieve.

Top: middle, center 中 (here: rotationally symmetrical around an axis丨), below: bowl 皿
A rotationally symmetrical cup has no handle.