The Visual Guide To Extra Dimensions Volume 1: ... Guide

A 2D being would see a 3D object as a series of 2D cross-sections.

The book begins with lower dimensions (0D to 3D) to teach readers how to "see" by analogy: The Visual Guide to Extra Dimensions Volume 1: ...

The Visual Guide to Extra Dimensions: Visualizing the Fourth Dimension, Higher-Dimensional Polytopes, and Curved Hypersurfaces . A 2D being would see a 3D object