Fundamental Jelly

While sorting through my digital photographs, I noticed that I had quite a few shots with air vents in the background.  I am told by members of the HVAC (Heating, Ventilation, & Air Conditioning) Industry that these vents are actually called ‘registers’ by folks who install them.  So, apparently I have a nice collection of registers.  I am not sure what this means, I don’t think I fear them or anything…YET.  I guess small CCTV cameras could be placed inside them to spy on us all.  But why would anyone do that? 

Register 26a

Register 57g

Register 92f

Images by Robert J