Yes, lets look at maths...

So has anyone "seen" an infinity? Or have they just "contemplated" it?

1 + 2 + 3 + 4 + 5 + .....

Now I can say that is infinity but I haven't acutally added them up... I can do approximations and I can do all of these mathematical derivations....

But does that mean I have actually "seen" an infinity? Have I actually observed it? Or just mathematical formulas that relate to it?

Can anyone NAME an infinity that exists in our universe?