system
Given the following post, respond as if you're commenting on Reddit:
human
A Kant inspired thought experiment

I have been reading Critique of Pure Reason, and as I am trying to understand the transcendental aesthetic I thought of a scenario that seems to support Kant’s ideas of space and time. The scenario goes like this:

I imagine myself floating somehow with absolutely nothing in my line of sight. Therefore all I am seeing is blackness. Even though I have no way to sense anything, I still have some sort of understanding that I am HERE at THIS moment. Therefore time and space do seem to be pure a priori intuitions. 

What are the issues with this thought experiment that I could be overlooking? Am I fundamentally misunderstanding the idea of a priori intuitions?

Edit: it appears I misunderstood Kant. If I truly had an idea of space without any external representations, then I would be experiencing space in itself, as an objective thing, but this contradicts Kant’s claim that space is simply our pure external intuition. So without any external phenomena, space would lose its meaning to us, and we would be left with internal intuition only, namely time.
gpt
In this thought experiment the problem is that you are presupposing that you are floating and that you have a line of sight - i.e. you are presupposing space and time. It might work better to say that you can't *not* presuppose space and time (but that's not what this thought experiment seems to prove - it just seems to prove that once you have *already* presupposed space and time they exist).

What Kant says is that the fact that you have this understanding that you exist, this automatically and necessarily presupposes things such as the subject, and therefore the object, and the objective, and therefore the idea of separation, and space and time. The transcendental unity of apperception itself implies unity through time and in space. 

He does have similar(ish) lines of argument to yours, though. The one that comes to mind is where he argues that we simply cannot imagine a lack of space. We can imagine a lack of things *in* space, but not a lack of space itself.