Discover puzzles where gaps and openings take center stage — literal holes, tunnels, portholes, skylights, craters, perforated metal, lace-like patterns, and negative space that frames a scene. These images emphasize contrast, depth, and repeated circular or irregular shapes that draw the eye inward and create focal mysteries. Expect strong edges, layered textures, moody shadows, and playful or eerie vibes. Great for puzzlers who enjoy pattern recognition, tricky interlocking pieces, and satisfying reveals as voids resolve into meaning.