I spent a good portion of the day teaching myself about panoramic imagery, with the goal of loading a site specific skybox into Enscape.
Enscape: Skybox as a Background

A wiki for Panotools was particularly helpful for understanding the different types of panoramic images:

Related to spherical projections, I also came across some fascinating tutorials on creating illustrations mapped for 360-degree panoramic, including application for VR backgrounds:
4 Steps to create a 360 VR illustration / painting in Photoshop (with pictures)
360° Panoramic Painting (Process)
JL Mast from Marvel Comics shares 360 drawing workflow

The last link lead me to learn about Kuula, a virtual tour and 360 pano image sharing platform.

GIF from “4 Steps to Create a 360 VR Illustration” by Lai