Good observation there, Crux. You may be onto something. Whatever they are doing, I do believe they are real and out there. Just very good at avoiding us.There are many known animals that can change their color which is just different wavelengths of light. So, they are controlling light to some degree. Maybe there are creatures/beings that can go a step further and bend light so as to appear invisible.
There are reports of encounters with beings who appear to be doing something like this, much like in the “Predator” movies.