someone tells you, the web developer, to render a red box,

I bet what you have in mind is “ok, I’ll create a div,

use some CSS to size, place, and color it”. Pretty straightforward.

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However, to do the same in 3D will require you to:

A. Create something called a “scene”

B. Define a cube geometry

C. Create a material and attach it to the cube (to make it red)

D. Create a camera

E. Add lighting

F. Tell three.js to render all that