You're 'justifyin' that there can be proof and using a shape to justify it, but that's not the same thing, I'm talking about space, like I said before.
I agree in my first post I didn't specify that enough maybe.

I don't have to justify something that doesn't have proof, that is the job of the proof itself, or the lack of it.

I am talking about literal, scientific proof that space goes on forever, and we just don't have it.

And why does existence have to infinite?
I'm not about to get all Christian and creationist and go on about the beginning, but we know that scientifically there has not always been life as we know it, so if there can be a blank space before the existence of a world that exists today, why can't there be a blank space in time?

There, I've just done what you did with the circle, used an example that proves nothing about the statement of the infinity of existence, so if you think to yourself 'That doesn't prove the lack of infinity of existence', that's how I feel about your circle.

I need more than a circle to convince me that space is infinte, and I disagree with your statement that it's manmade (Look at the sun, we're surrounded by cirlces, giving it a name isn't creating it, second thoughts, don't look at the sun.)

Although I agree time and space are infinte, I can't provide proof either way as it's a belief, not a fact.
We are just little humans, and to think we can make guesses about the infinity of time and space is almost as mad as thinking we know the facts about why we're here and package them up in religion.