The quiet room in my house has only one seat. I find this discourages idle chatter, which makes it an excellent place to ponder.
As I ponder, something inevitably occurs to me that I want to get on paper right away. I keep perforated stationary in a holder beside the seat.
The holder is a spring-loaded wooden roller between two ceramic arms. It's a classic design, possibly dating back to Seth Wheeler's 1891 invention of perforated wrapping paper (patent # US465588 A).
For 35 years I've been plagued with an inconvenience: sometimes when I tear off a piece of stationary, it continues to unwind all the way to the floor.
Eureka! I looped a rubber band around the knob at one end of the roller, ran it along the roller, and looped it around the knob at the other end. Now friction keeps the stationary from unwrapping on its own. I predict that my discovery will make it practical for millions of Americans to begin using perforated stationary in their quiet rooms. I'm going to buy stock in the companies that produce it.
Well, I'm off to my quiet room. I don't like to ponder in my computer chair.