UI complaint - I thought the "V" was a variable, and I scrolled down a bit and started hitting buttons, and none of them seemed to do anything to affect the vis

UI complaint - I thought the "V" was a variable, and I scrolled down a bit and started hitting buttons, and none of them seemed to do anything to affect the visual. Only later did I realize there was another visual below the controls that you're meant to be observing. Perhaps it's just me, or perhaps the placement of the "V" as a way to get users to scroll down isn't ideal. Other than that, it does seem like a neat way to present the physics concepts!