I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
Oh boy. Similar story for my wife and me. Now we've got 3 gaiwans, 4 yixing clay pots, and two cast iron pots. And now we do a little tea ceremony everyday. It's a great way to just sit together and chat without other distractions.