Experiment

One page, one decision, N candidates — all built in at once behind a floating switcher pill, instead of shown one at a time. The user clicks through the live page and picks by feel. The whole thing is a harness: loudly temporary, trivially removable, with a documented ship-the-winner path.

Two branches: build a harness (the default) and ship the winner (when the user has picked).

Branch 1 — Build a harness

1. Frame the decision

• Pin down the single decision under test (one harness = one decision) and give it a short label for the pill, e.g. BG, HERO, MOTION.
• Assemble the variant list: variant 1 is always the current baseline; the user's floated ideas each become a variant done well (polished, not a sketch); add 1–2 tasteful variants of your own. Aim for 4–6 total.
• Confirm the list with the user in one message before building. Done when the user has seen the numbered list.

2. Implement the variants

Pick the switching mechanism that fits what varies: