Software based Artificial Life system installation. Java 3d, L-Systems in silico is an interdisciplinary artistic project which tries to search how to define “alive”, starting from an artificial life system. During the process of this work, it is explored the growth, communication and interaction systems of an organism into this environment. At the same time, this project suggests the visual approach to an environment, which doesn’t describe a “real world”. One of the objectives of this part is to ask and understand our relation with something that we perceive as “alive”. It is a software-based artificial life system. Synthetic organisms modeled in 3d and designed with L-system grammar grow, interact, replicate and die. Besides the formal aspect, in silico is based on the Artificial/Natural dialectic, and the different ways authors understand it.