Simple but 'good' set of demos

[lemio]

Is your feature request related to a problem? Please describe.
It would be great to have a simple set of demos:

• That use 3 or 4 IDs and are easy to switch in between; I now always had to remap the items to the pieces of paper I had.
• That are well documented by a video explaining the concept, ideally in the creator somewhere
• That have self explanatory names and comments
• That show just a little more than showing and hiding elements based on elements present.
• That don't use the background effects (since this messes with the projector/white balance of the camera); I had a disco with some of the examples untill I figured out which node contained the background effect.
• That ideally doesn't draw over the dots, so that the elements don't break because of difference in light.
• That show how to do interactions between elements (both rotation, position and scale).
• That might also attract more 'professional' context; the best demo I could find so far was the cat catching the dot; but I could imagine really cool demos around data visualisation and interaction concepts.