Teaching the Concept of Infinity to Children. I was recently out with the family and we left it up to the children where we ate lunch (11 and 9 years old). They couldn't agree and were going back and forth calling each other names. This ultimately lead to the age old tradition of one kid saying to the other "You're stupid times infinity". Afterwards, the 9 year old asked me what infinity was and I attempted to explain it to him in the way that I understood it as a kid through audio and visual feedback examples.
Audio feedback (simplified): the loop created by a microphone and amplifier when the microphone picks up the sound coming out of the amp.
The example I used for visual feedback was the loop created by two mirrors. This was the one that really resonated with the kid and seemed to help them understand a bit better that infinity was without a limit (or endless as the kid understood it).
What I'm wondering, is if these are viable real life examples of infinity. If so, are there any more that could be used? 
I read through a few of the other questions on infinity here on MSE and they didn't quite talk about infinity in this sense. This also got me to think that perhaps this is intentional and that we cannot have a legit real life example of infinity.

To tell someone what infinity ... Take a sheet of $A4$ paper and divide it into two halves. Now take one of the halves and divide it again. Repeat this step indefinitely. Here ask the question 'Will this process finish?'.
