Interlocking puzzle pieces with central void

Four interlocking puzzle pieces, with a glossy finish, form a square. Each piece displays a distinct, saturated color red, green, orange, and blue. Two opposing pieces feature protruding connectors, while the other two opposing pieces exhibit corresponding recessed connectors. One piece shows a concave void where a connector would typically be located. The pieces overlap slightly, suggesting connection and assembly. The material appears smooth and potentially plastic or resin-based.