Flatland by Edwin A. Abbot
Last weekend, I listened to Edwin Abbot Abbot’s Flatland: A Romance of Many Dimensions (Audible) while painting the new office. From the Amazon editorial review:
Flatland [...] was published in 1880 and imagines a two-dimensional world inhabited by sentient geometric shapes who think their planar world is all there is. But one Flatlander, a Square, discovers the existence of a third dimension and the limits of his world’s assumptions about reality and comes to understand the confusing problem of higher dimensions.
I liked it. Particularly how it conveys the difficulty for “flatlanders” to conceive of another, third, dimension – and olso for “linelanders,” a world with one dimension, thus inhabited by sentient points, to conceive of the second dimension.
As it is in the public domain, it is of course available online.