Carry a dark fineliner for outlines, a brush pen for headings, and a single highlighter for emphasis. This kit travels anywhere, limits choices, and speeds decisions. When constraints remove fiddling, attention returns to listening, thinking, and shaping meaning rather than decorating empty margins.
Use diagonal hatching under icons and along the right edge of containers to suggest volume without muddying text. A few consistent strokes add hierarchy invisibly. Photos reproduce line shadows more reliably than gray markers, preserving contrast when you share notes on screens or printouts.
Pair color with labels so meaning survives grayscale photocopies and color blindness. Add a tiny legend explaining your marks at the page edge. Inclusive notes invite broader participation, reduce misunderstandings, and make your visual vocabulary useful to teammates using different tools, screens, or printers.