Lưới Áp Phích Ẩn Dụ Không Gian Âm Tối Giản

A 2x2 grid of minimalist high-contrast silhouette posters exploring the concept of [nature vs technology]. Each panel features an optical illusion and visual metaphor: a bold primary silhouette forms the main subject, while a hidden secondary figure is cleverly integrated into the negative space to convey a conceptual duality. Clean graphic shapes, flat vector illustration style, limited duo-tone color palette, sharp contours, and high visual readability.