My most imagined metaphor for bitcoin described by my insomnia brain:

I like to think of stored value as a bit like mass. All things with value have proportional "mass" and any money or monetary network, or anything really, has a value density.

As things become extremely "massive" they have their own gravitational pull to value from other things with value. How many people invest in large companies or funds in large companies, just because they are so massive (even if not profitable!) that they pull value in? Like a forming planet - especially in a system of easy money.

What bitcoin represents is something finite and with maximum desirability (that of good money), this doesn't mean it can become infinitely massive though, infinite is literally impossible because there is a number which exists which can describe all of the value which is at any moment. But it represents something which can become comparably massive to a black hole where you can't reasonably measure it's pull and monetary physics seem to break as everybody with value stored in anything else is pulled into this thing.

Bitcoin will only ever be theoretically a black hole of value though. It always sheds value into other places as value is not exactly the same as mass. People with bitcoin want and need other things so must move value out too. That isn't to say that there will not be an event where the value of almost every other monetary network and significant store of value product that remains get pulled into bitcoin in a very short span of time. I think this will happen too.