Spend a session shooting only vertically. It changes what you look for. Verticals work with tall subjects, narrow spaces, people in doorways, figures against sky. They also work for sequences - a vertical strip reads differently to a horizontal contact sheet.

Watch for: the urge to rotate back to landscape. Resist it for the whole session. Constraint is the point.

Try this: When you find a scene, make the vertical frame first, before you default to landscape. Look for tall context above and below your subject, a towering building, a long cast shadow, a column of sky, and let the format stretch the eye.

The point: most photographers default to horizontal. Shooting vertical all day forces you to see differently.