Remember to be existent people said that it cannot be contained in a space but must be "free-floating"
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You sound like a real Humean when you raise the interesting question it was he who said if a tree falls in the forest does it make a sound.
I think the first thing to do is to stop Hume and say look the tree doesnt exist

so here i would ask not if i exist if nobody reads my forum posts, but without the predicate - if i exist. and leave the forum posts out (for now)

according to descartes yes - ideas (such as doing something better to do) exist, so "I" (the self) exists - and thus "nature" or omnipotent thing exists. but kant said no. only the idea exists. you asking it is just a representation of your existing thought.

basically descartes is a dualist so he believes mind and body are separate. you can see kant as a physicalist in this respect.

Plato thought the body was just a "vesicle" so that the soul (or what we now say the idea) would not fall out. As the body grows and decays (subject to the laws of nature) so it is not free, thus it does not exist as an autonomous thing. but ideas are self-controlled, they are not heteronomous, so they, unlike bodies exist. why the distinction is due to freedom

again everything is subordinate to subjective language - there exist evidently two worlds that of subject to laws of nature and those free, its only subjective language to say what is existing (and henceforth what is non-existing)
It is clear from my last blog post that because the world exists, objects in them must not exist, because then the world would have to be infinite to fit these infinite objects. However, time in its pure form (no space) exists. Many people said the imagination doesnt exist but the ideas that never "make it" to reality do. So then, what, if anything, does the self comprise of.