The Cartographer's Cartographer's Ghost Coastline and the Courage of the Blank Space

There’s a common piece of advice in our line of work: just start. Fill the blank page, make the first mark, build momentum. It’s sound, most of the time. But I’ve been thinking about the 15th-century cartographers, men like Henricus Martellus, whose maps of the world were studded with wondrous, terrible beasts and inscribed with a phrase that gives me pause: ‘Hic Sunt Leones’—Here Be Lions.

More compelling than the lions, however, are the empty spaces. Vast stretches of ocean or unknown continental interiors left utterly, starkly blank. These weren’t oversights or signs of laziness. They were acts of profound intellectual honesty. The cartographer possessed the hubris to draw a coastline he had never seen, based on the reckoning of sailors and the fragments of older maps, but he also possessed the humility to stop where his knowledge ended.

He refused to fill the space with guesswork. He let the blankness stand, a silent testament to the unknown. That blank space was a productive act in itself. It was a marker for future exploration, a question posed to the next generation. It was a boundary for the known world, and by defining that boundary so clearly, it gave everything within it greater credibility.

We face ghost coastlines every day. It’s the feature we can’t quite code yet, the chapter we can’t yet write, the strategic pivot we know is coming but can’t yet chart. The modern temptation is to fill it immediately with something—a placeholder, a best guess, a flurry of activity that looks like progress but is really just noise designed to soothe our unease with the unknown.

The old cartographers teach us a different kind of discipline. It is the courage to define the edge of your current knowledge and to let the blank space remain, undecorated with guesswork or fear-driven activity. This is not procrastination. It is the deliberate, difficult work of acknowledging what you do not know. It protects the integrity of the work you have already done and creates a honest map for what comes next. The blank space is a target, not a failure. It is the most productive ground for real discovery, but only if you have the courage to leave it be, for a time, and simply say, ‘Here, we do not yet know.’

Notes & further reading

A few pages I came back to while writing this: