How do you explain Bitcoin to someone ?

I had this one moment where the metaphor struck me perfectly. I’ve been trying to get my partner to invest a bit more in Bitcoin. We were in a field with our son and it was snowing. We were rolling up a snowball to make a snowman. I told her to think of all the snow in the field as all the Bitcoin in the world and that eventually it will stop snowing. The snowball I was rolling was my Bitcoin and I’m trying to make it as big as possible because all the snow around us is being bought up by corporations and governments and rich people. Also that these people are less likely to sell it making it much more expensive to buy. She had no idea that Bitcoin was even something that was a finite supply. Nevertheless she isn’t any more invested because of this explanation but one day she’s going to see how much more snow she could’ve had.