I still feel like this argument could be transferred to nearly any concept in CS though. Abstract enough anywhere and you will always start exceeding the brains working memory.
We are just pretending, there is nothing to understand?
They aren't even numbers. They're voltage-high and voltage-low signals.
Numbers don't even exist! You'll never find a 2 in nature. You'll find two things, but you'll never find the 2 itself.
And all 2s are the same 2. But every voltage signal representing a 2 is a completely different voltage signal. Sometimes they aren't even voltage signals! Sometimes they're magnetic flux signals! Sometimes they're electrical field signals! Sometimes they're photons modulated down a wire made of glass!
But the 2 they represent? Not even that is 2. It's 10!
Like we pretend it is high for convenience while we really mean higher. For all practical purposes our imaginary world works! hurray!