Here is dandelion (Taraxacum officinale) pollen at 400x magnification. Hexagonal symmetry can be seen in some of the pollen grains. These grains are 45-48 micrometers in size. Of course the grains are 3-dimensional, and possess a cage-like structure.
Equipment used: AmScope M150C microscope with Raspberry Pi camera module V2 (8MP).