Flatland: A Romance of Many Dimensions' by Edwin A. Abbott (1884)

The protagonist, A. Square, lives in a two-dimensional world called Flatland.

He is visited by a mysterious three-dimensional sphere who attempts to explain the concept of the third dimension to A. Square.

A. Square discovers that the laws of Flatland prohibit any discussion of a dimension beyond its own.

He is arrested for heresy and sentenced to prison for attempting to teach others about the third dimension.

While in prison, A. Square comes to understand the higher dimensions and begins to advocate for them.

He is released from prison and begins to spread his knowledge of higher dimensions.

He is met with opposition and persecution from the inhabitants of Flatland, but he continues to advocate for higher dimensions.

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