Definition: Motion is the function of time for the structure of a system.

There is no absolute stillness in the world, and even if there is absolute stillness, it can be regarded as a special kind of movement. All movements and changes of matter are structural changes. The advance of time means the movement of the system. Structural change includes the change of ordinary structure and the change of generalized structure.

The incoordination of movement between the various parts of the system is a kind of structural error, and the incoordination will reduce the function of the system. For example, when performing arts, lighting, scenery, props, and photography should be synchronized with the performance, if the lights are not bright during the performance, but bright after the performance, which is changing the structure that should be. This structural change will naturally produce functional changes, that is, the performance fails. People are part of groups or social organization, and incoordination between people's behavior and others will also reduce the function of the system. For example, lateness is a kind of structural error, which changes the function of the system.

Eric Jentsch refers to the structural change content represented by time as process structure, and the spatial structure as component structure (Eric Jentsch. "Self-organizing cosmology". Translated by Zeng Guoping et al. China Social Sciences Press,1992,pp.30.) This distinction shows that he paid attention to the relationship between time and structure. I argued in my book "Self-Organized Life Philosophy" that there was no need to use the term "process structure," and now I think it is not only necessary but important to use the term.

The function of system is determined by structure, which includes the spatial structure and the process structure. Time is a kind of structural relationship, and the sequence of events determines the function of a system.