A living organism is a complex assembly system with multiple components and levels. The lower level assembly emerges new functions on the higher level assembly through the exchange of materials, energy and information. For example, interaction networks among organelles endow cells with various physiological functions. Interaction networks among cells via chemical communication endow tissues and even organs with functions. The functions of the advanced-level assembly are often not possessed by the single low-level sub-assembly, and the key to realize this emergence lies in the interaction network built by the exchange of materials, energy and information among the assemblies. Inspired by living assembly systems, we are committed to building interaction networks based on molecular communication among artificial assemblies, realizing the exchange of information, matter and energy among assemblies, and promoting their self-organization to form higher level assemblies and emerge new functions.