hi big c
well im not stating any facts as such cos i dont realy know but i am suggesting that since we see with the reflection of light...i think
if the object disrupts the reflection ... or does not reflect...or simply washes its self with a light frequencey we cant see with our eyes then i gues it would be cloaked... to us that is
i have heard a suggestion that some ets are receptive to effects on people and being annoyed by us simpletons

so they probly perceeved your gaze...
as you would / do when someone is staring at you from behind... you can feel it...rite...?
times that to the factor of x many years advancement and you get realy groovy technology...

just another earthlings point of view as i ponder

and again one could argue that they might make you specificaly incapable of seing them by merly bending your reality to a primative level of self doubt?
i better stop there before i give any bad sorts any new ideas

hope that gives you something else to think about
i dont realy know im just guessing at some potential
thingeys
groove on