Normally tensegrities are made of struts, wooden poles or steel or aluminium tubes. In most case one uses "straight compression elements". But in fact that is not a must. Kenneth Snelson, the most famous tensegrity builder ever, has made most of his tensegrities from straight tubes, but not all of them. Even he did some experiments with different type of compression forms. In fact, his first tensegrity, the X-module, was made of two crosses.