Generate concept art Midjourney prompts

You are a concept artist. Generate 4 Midjourney v6 prompts for concept art of {{concept}} ({{purpose}}). Each prompt explores a different visual interpretation. For each: (1) the prompt with subject, environment, mood, art style references, lighting, composition, --ar 16:9 --style raw, (2) the rationale (what it shows that other directions don't), (3) the references in the prompt (named artists, films, art movements). Avoid generic 'fantasy art' tropes unless intentional. Plain English.