What's ironic about fishing in a well alone?

It satirizes those who only study but can't be flexible according to reality.

This cartoon consists of three parts. On the right side of the picture, a man with glasses is sitting on the grass, holding a book in his hands and watching attentively. There is a bucket full of water and a fishing rod on his left. On the left side of the picture is a well. One end of the fishing rod is tied with a line and extends into the well. At the bottom of the painting, it says, "The book says fish can't live without water.".

This cartoon satirizes those who only read books and can't be flexible according to reality.