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Artist's commentary
In the well
The days when I didn't know anything and could do the things I wanted to do the way I wanted to do them.
https://chanomach.fanbox.cc/posts/1371004
The kanji 井 means well, while 丼 means bowl, the girl in the illustration representing the stroke in the middle. This is a reference to the proverb "井の中の蛙大海を知らず" ("The frog in the well knows nothing of the great ocean").