Hello everybody. I have walked past these things so many times and each time think "what the heck could they be?" I go to Siena Heights University in Adrian, MI, and our theatre is at least 30 years old which explains why we have so many HUB ellipsoidals and fresnels. But these wall boxes are made by HUB too! These are found in our catwalks, but on only the 3rd out of 4 cats. I wondered if they were some ancient cat lights which would explain why there is a place for a fresnel bulb, but then why only on this cat. We have three of these equally spaced on a 40 or 50 ft catwalk. They are definitely meant to be plugged in... 1st and 2nd picture are of one box, and 3rd and 4th picture are of another, in various states of disrepair. 5th picture is of the stickers you see in 1st and 3rd pics. 'Tis a mystery!