Or, it's the work of the Anti-Electricians!! [love that message, Sparky!!].

Bill;

I think I can see where you are going with the question about the upper right corner.
In other words, I can smell the Insulation burning from here !!!

Sure is an elaborate installation, though. I see 3 wiring methods at that 4/0 box. The little flex stub, the Romex and what appears to be an orange extention cord.

I feel sorry for the poor fixture and motion detector! [Linked Image] Looks like the plywood is the next thing to feel sorry for [when it begins to glow and smoke ~:-O].

Scott.

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!