Some tile types that retain the Holliday junction's native 60° angle have been demonstrated. One such array uses tiles containing four Holliday junctions in a parallelogram arrangement. This structure had the benefit of allowing the junction angle to be directly visualized via atomic force microscopy. Tiles of three Holliday junctions in a triangular fashion have been used to make periodic three-dimensional arrays for use in X-ray crystallography of biomolecules. These structures are named for their similarity to structural units based on the principle of tensegrity, which utilizes members both in tension and compression.