I don't have any cool heirlooms. Nor did I keep much of my stuff from childhood. I have a few prized possessions -- things I take great pleasure in. First would be my coffee setup. I have a nice kettle and pour over setup that I really love. I don't use it every day, but when I do use it, it's such a pleasure and it turns coffee from a drink into a craft. My second item would be my desk at home. I've got this wonderfully long desk. It just looks great. It gives me a great spot to put all my things (keyboards among them) and it's big enough to sit two people. My daughter and I can both sit at the desk at the same time which is really nice. Lastly, I'd say my computer is really important to me. I bought a *cough* iMac Pro *cough* and YES it's way over powered and over kill for what I need, but IT IS SO NICE. Long time Mac fan and yet I've only bought the laptops and even then, it was their "cheap" laptops. I've never had their top of the line computer. Some might argue about "top of the line" but for the things I'm interested in and do, it really is.
Now, I do expect that when the Kira keyboard comes in, combined with my laser keycaps, that could well become a true heirloom thing. I'm not kidding. But this won't happen for awhile, so it'll be just a wait and see.