プレミアム錯視ロゴデザインプロンプト

Create a clean premium logo design for [Brand name] based on the letter [Core letter]. Turn the letter into an optical illusion brand mark using folded geometry, spatial depth, precise edges and strong negative space. The logo should express [Symbol meaning] while remaining readable, minimal and memorable. Center one large logo mark on a plain warm ivory or soft light gray background. Add only the brand name "[Brand name]" underneath, with an optional short subtitle "[Subtitle]". Minimal black-white-gray palette, premium modern identity design. No poster layout, no construction grid, no annotations, no extra icons, no decorative small text, no mockup clutter, no messy 3D, no distorted typography.