There is an odd intimacy to crafting the small tools that shape how we see text. For years I’ve been fascinated by a particular, quietly powerful feature in terminal emulators: highlight sets. In Xshell—NetSarang’s polished SSH/telnet client—highlight sets are the kind of modest convenience that change how you work without fuss or fanfare. This is a chronicle of that change: the feature’s origins, its practical heartbeat, the personalities it reveals, and the curious ways a tiny palette of colors can reorganize attention, memory, and control.