も
mo
も puts one more thing on the same pile
The picture A hand setting one more thing on a pile that is already there. Everything lands in the same place. も adds one more onto the pile; だけ fences off one and leaves the rest outside.
Where the picture shows up in も
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me on the pile too
私も行きます。
watashi mo ikimasu
I'll come along too.
My hand going up beside the hands that are already raised
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today on the pile too
今日も残業です。
kyō mo zangyō desu
Overtime again today.
The same stamp coming down on today's box, right next to yesterday's
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neither one on the pile
お金も時間もありません。
okane mo jikan mo arimasen
I have no money and no time.
An empty wallet and an empty calendar lying side by side, both bare
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a pile higher than expected
三時間も待ちました。
san-jikan mo machimashita
I waited three whole hours.
Sitting in the chair watching the clock hand go round three whole times
も on a number turns it into 'that much'. 三時間待った is a fact; 三時間も待った is a complaint.
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not once on the pile
一度も行ったことがありません。
ichi-do mo itta koto ga arimasen
I've never been there, not once.
A field of snow with not one footprint in it
All of it in one picture
も is a hand setting one more thing on a pile that is already there. Add my hand to the raised hands and it is 'me too'; add today's box to yesterday's and it is 'again today'. Put money and time both on the pile and find both of them bare, and it becomes 'neither one'; let the pile stack higher than you expected and it becomes 'three whole hours'. A spot where nothing was ever set down is 'not once' — one gesture, five uses.