What actually makes a collection feel cohesive?

I’ve been thinking about cohesion a lot lately. Not in the “three-watch collection” meme sense, but in the lived reality of what earns wrist time. When I started The Keeper Box, I was the guy who justified overlap: two divers with similar dials, three field watches within a millimeter. They looked great in a watch roll, but on my wrist only a couple sang. The ones that lasted shared a few things: slim cases, legible dials, and movements I trusted to service without drama. My anchors today? A Hamilton Khaki Field Mechanical (H-50) that I actually enjoy winding, a Formex Reef whose bracelet engineering spoils me for lesser clasps, and a Farer GMT that turns travel into a ritual. That trio set my bar for ergonomics and character. Everything else has to earn its place—Baltic for neo-vintage charm, Citizen Eco-Drive for grab-and-go honesty. If it overlaps too closely or fights the theme, I move it along. I’m curious where your cohesion comes from. Is it function (field/diver/dress), a design language (color, typography), or a movement story (ETA, Sellita, Miyota, Seiko)? Which piece is your anchor, and what watch got edited out because it didn’t fit the through-line?