还
hái
The line that hasn't been cut yet: 还
The picture A line that should have ended, but keeps running a little further. 还 is the line still running, not yet cut; 再 is a fresh one laid down after the cut.
Where the picture shows up in 还
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time still running
他还在开会，您稍等。
tā hái zài kāi huì, nín shāo děng
He's still in the meeting; please hold on a moment.
The meeting-room door still shut, the wall clock's second hand still sweeping.
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one more on the line
还有别的事吗？
hái yǒu bié de shì ma
Is there anything else?
A finished list with one blank line still left under the last item.
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past the line
今天比昨天还冷。
jīn tiān bǐ zuó tiān hái lěng
It's even colder today than yesterday.
A thermometer sitting one notch below the mark drawn for yesterday.
In comparisons 还 means 'further past that point'. It sounds softer than 更.
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barely on the line
这家店的面还可以。
zhè jiā diàn de miàn hái kě yǐ
The noodles here are decent enough.
A needle that stops just barely above the pass line.
All of it in one picture
还 is one line running forward, not four separate words. The clock still sweeping is 'still'; the blank line under the list is 'one more'; dropping past yesterday's mark is 'even more'; stopping just over the pass line is 'good enough'. See the line that nobody cut and the four uses stop being four things to memorise.