Mix of various pattern most of them procedurally generated using geometric nodes and also some manually designed years ago (one of them after this picture https://gov.cap.ru/UserFiles/photo/201703/29/Albom206997/dsc04807.jpg). The 3 main pattern use a multiline style of tubes, with both square and diamond layouts and on the largest central pattern the tubes thickness varies according to opposite gradient values (going away from the center the square layout golden tubes fatten while diamond layout marble tubes shrink).