Martinus made a series of symbols that use colours and geometrical figures to illustrate the eternal, spiritual laws and principles. The symbols, which are described in detail in The Eternal World Picture 1-4, can be purchased here without the explanatory texts for use in, for example, study groups, private study and so on. The symbols are available in three sizes: large (approx. 50 x 65 cm) - selected symbols only, A3 format (29.7 x 42 cm) and book format (18 x 25.8 cm). Also available as overheads (A4 format).