Arts And Crafts For The Paranoid

I found this block of wood and couldn't work out what it was for. It's been shaped, with bevelled edges, but not to a high finish. In other words, it's a bit sloppy but it obviously has a purpose.

None of the furniture is falling over. Nothing's out of place. Everything is working and this piece of wood just appeared. It's like the one extra bolt left over after rebuilding an engine... except it just arrived in my life with no rebuilding having gone on. What's its caper? Where does it belong?

So I did the only logical thing I could. I gave it some added features and now it's just a square pig looking for a round hole.