First time on webXR
The What do prototypes prototype? reading was really interesting. Although I didn't agree with everything, especially the part he says "high quality appearance models are costly to build." in these days I don't believe it's true, there are a lot of prototyping tools that everyone can use and create high quality appearance prototypes.
But over all, it was well written and helped me to reorganize my thoughts about "what makes a prototype become a good a prototype".