Well, one has to start draw the circle from one point. And that is the main point! And, after that, it can go on and on.
IG, I really like your reply BUT whilst what you say is true of the idea of a human drawing a circle, I am talking of the concept of a circle, which has no beginning and no end in time (or outside time for that matter).
It is directly analogous to my flatlander story. There, the sphere, on the surface of which the flatlanders live, has no beginning or end in time, as a concept.
To progress it further, the flatlander understands time, perhaps as the medium through which his Universe expands.
Now, here you will have a laugh with me, because I anticipate your next response. The flatlander will argue that because he sees his Universe expanding, then it must have started from nothing - from a Big Bang - so I will reply that either his Universe
or his appreciation of his time will contract approaching
infinitely slowly.
You have seen me use the I-word
but in a mathematical 'philosophical' sense where it does have a limited use. Of course, the (n+1) dimensional observer will not have this problem. We use the I-word when we need it to get around a problem. That is why we (well, not me personally) like and use it so much. Don't forget, in the analogy
we can be the flatlanders.
I believe it is a lesson to us, because whilst analogies do have limitations, there is an old saying "As above, so below" and I believe this is very true.
Not blind belief, but belief in the utility of the idea as a useful part of my intellectual armoury.
I hope this helps.
Cat