One of Laban's primary contributions to Laban Movement Analysis (LMA) are his theories of Space. This category involves motion in connection with the environment, and with spatial patterns, pathways, and lines of spatial tension. Laban described a complex system of geometry based on crystalline forms, Platonic solids, and the structure of the human body. He felt that there were ways of organizing and moving in space that were specifically harmonious, in the same sense as music can be harmonious. Some combinations and organizations were more theoretically and aesthetically pleasing. As with music, Space Harmony sometimes takes the form of set 'scales' of movement within geometric forms. These scales can be practiced in order to refine the range of movement and reveal individual movement preferences. The abstract and theoretical depth of this part of the system is often considered to be much greater than the rest of the system. In practical terms, there is much of the Space category that does not specifically contribute to the ideas of Space Harmony.