A link from a former student, accompanied by the following email:

So, I found this thing and it’s really cool and you should totes look at it. I think it’s super duper awesome, but you being the science teacher have probably seen cooler stuff….

have fun :D

While I haven’t seen this, I have seen similar things.  This one does as good a job as the others, if not better.  I love me some scale demos.

I concur with the opinion that it is “super duper awesome”, indeed!