Dump element for forming a spatial structure (500, 501) such as a filtering or skeleton construction with such dumped dump elements. The dump element (99) comprises a first elongated, curved hook part (1), a second elongated, curved hook part (2), and a spacer (3) between the first (1) and the second hook part (2), which spacer holds said hook parts (1, 2) spaced apart and interlocks them. With a method for forming a spatial structure, dumped dump elements randomly interlock. In a spatial structure, hook parts of individual dump elements lying near each other interlock while then, the hook parts intersect in their longitudinal directions.