If you had no perception of anything, say if you were born with no senses whatsoever, (this is a hypothetical, to prove a point) then you'd have no reason to believe you exist, and forming thought would be difficult to begin with because you'd have no point of reference, be it from touch or taste or any of the other senses. I suppose I'm trying to say, instead, personal existence is subjective and based on perception. Our lives end when we lose functionality in our vital organs, heart and brain. At that point, to us, we don't exist. Granted, you won't be able to argue for the dead or what comes after, but even if I'm wrong it's still interesting to think about. (and I could be wrong but I wanted to throw an idea out there)
It is the old "if a tree falls in the forest..." question. Basically for something to exist in actuality, it requires that someone or something has acknowledged its presence. That requires perception to interpret if something seen, felt, heard, touched, or even smelled is in actuality physically present. What complicates this concept is the fact that different human beings may perceive the same events in different ways. To some humans, things that other humans can't (or choose not to) perceive like ghosts, angels, etc exist, and that is a perfectly valid opinion.
Albert Einstein proved that existence is based upon perception with the use of quantum physics. Two people can see the same event, scientifically speaking. Yet they will interpret the event differently, see it differently and measure it differently. A person with sight can argue to a blind person all day that there is a large wall in front of the person, yet the blind person can't conceive of the wall until he or she feels it with his or her hand. To the blind person, that wall doesn't not exist until it is felt.
To the adverage space rock, existance is cause and effect. The laws of the universe (mostly followed) are creations of man to name cause and effect in the all of everything. It is very easy to name existing objects in THIS universe. What what of The Multiverse, The entire Cosmos... then our rules no longer aply and the organization collapses. That is why we Humans are so interesting... created with the ability to understand, but not that that is tuned to such a complexity that there are no rules that can aply. We would fall apart if we ever found something that is impossible to understand. Which is why we need a universe, in a way. But really without those rules... not being able to catagorize, organize, rationalize... nothing exists... and to some up everything in words we can organize, truly there are none quite as spectacular as needed, but really "happening" is all that... I would say "is" but nothing "is" if nothing exists... om, thats a good word for all everthings everywhere and nowhere... I think Ill invent a phrase to discribe it... "omnia et singula mirabilis mundi" - Skylark Funderberg. I really think latin sums up Humanity... it has such weight to it.
If a person attempts to perceive that someone else does not exist, that does not stop another person from existing. Likewise, if someone attempts to perceive that an object is no longer present, it does not make the object go away. Existence is an objective reality, not the subjective perspective of one or many people.
Your trying to make it a possibility. And unfortunately it's not a possibility. But, it is a food for thought. Existence is the truth. The fact. The sign of stir. You sometimes hallucinate. And what you hallucinate is the existence of facts. The certain other facts that contribute to be a part of that particular hallucination. Perception on the other hand is the Brain Game. Brain is stupid without emotions. If you add a little to each act do you give it a meaning. Brain is so strong that it sometimes confuses itself. Instantly.
But, that was a very nice thought.
Our perception is a matter of epistemology--it tells us what is so. Existence is a matter of ontology--what actually IS so. Since it is possible to perceive something that doesn't exist (e.g. hallucinations, dreams, phantom limb syndrome, etc.), there is obviously a disconnect between perception and existence. Also, if something had to be perceived in order to exist, it would follow that it's impossible to ever discover something. When yo discover something, you find out that it was true all along, even BEFORE you perceived it.