Figure A from the Ars brevis, representing the fundamental principles of the Art. Source: manuscript f-IV-12 from the Escorial.

Third Figure from the Ars brevis, representing all binary combinations of the principles from Figures A and T. Source: manuscript f-IV-12 from the Escorial.

Figure T from the Ars brevis, representing the relational principles. Source: manuscript f-IV-12 from the Escorial.

Fourth Figure from the Ars brevis, where, by rotating the two inner circles, one can find all the possible ternary combinations of the principles from Figures A and T. Source: manuscript f-IV-12 from the Escorial.

The Alphabet of the Ars brevis, after the edition of A. Bonner in Selected Works of Ramon Llull.