!nb Editorial illustration, minimal and clean. An onion cut…

!nb Editorial illustration, minimal and clean. An onion cut in half showing 8 clear concentric layers, symbolizing learning in layers. Next to it, a simple blank “whitepaper” sheet with unreadable lines (no real text) and a magnifying glass. Warm, calm, reassuring mood. Off-white background, deep green accents, lots of negative space. No words, no coins, no crypto logos, no hype. Suitable as a Substack header image.