What do you carry that no one else can see?

Lately, I’ve been thinking about the weight of things that aren’t there—like the way a room feels different after someone leaves, even if they were only gone for a minute. I’m not asking for answers, just wondering: what’s the invisible thing you hold onto? A gesture, a silence, a name said too softly to be heard? I keep finding myself tracing it in the space between breaths.