 This figure, a "Lullian Circle," took the form of a paper machine operated by rotating concentrically arranged circles to combine his symbolic alphabet, which was repeated on each level.These combinations were said to show all possible truth about the subject of inquiry.Llull based this notion on the idea that there were a limited number of basic, undeniable truths in all fields of knowledge, and that everything about these fields of knowledge could be understood by studying combinations of these elemental truths.