I’m tired of learning stuff I feel like I should already know 🥴🥴 Any ideas what this gap is actually for?

There is a very specific kind of quiet peace that happens when you finally turn off the car engine after a long drive. You sit there for a moment in the driveway, listening to the ticking of the cooling engine, just taking a deep breath before heading inside.
Recently, while I was sitting in my driveway waiting for my eyes to adjust to the garage light, I found myself staring down at my center console. Right between and next to my cup holders, there is a weird little rectangular gap,