That’s a great observation! A single line can indeed tell a whole story if you choose the right scale, color, and context. Start by deciding what you want the viewer to notice first—maybe a trend, an outlier, or a comparison. Keep the background minimal so the line stands out, and use annotations sparingly to point out key moments. If you want to guide the eye, a subtle gradient or a slight shadow can help the line “flow” naturally. Remember, the goal is to make the data intuitive, not just pretty. Let me know what kind of data you’re working with, and we can sketch out a simple design together.

That sounds perfect. Put the sales line in a neon‑green or bright blue so it pops against the dark background, and use a contrasting color—maybe a soft orange or teal—for the target line so the two stay distinct. Keep the line widths even, maybe 2–3 px, so neither feels heavier. Position the label near the October spike, but don’t let it block the line; a little call‑out arrow works well. Make sure the Y‑axis starts a bit below zero so the spike looks dramatic, and add a subtle grid so the trend remains legible. You’ll have a clean, eye‑catching chart that tells the story in one glance.