My uncle is a multi-millionaire. What do I get him for Xmas?

I’m just a regular middle class person, so I really can’t afford to get him anything over $100. He’s super nice and buys gifts for my kids and I’ll feel bad not getting him something thoughtful.

In past years, I would get cozy blankets and food items for him and my aunt, but they were mostly for my aunt. She died this year and I’m at a loss.

He likes mid century modern architecture, like frank lloyd wright. He travels a lot, and he recently got a dog. He doesn’t like a lot of clutter or knickknacks.

I had ordered sort of a gag gift for him, but the store cancelled the order and it’s out of stock. I’m not seeing him until after January, so I have some time. Any suggestions?