Page "Tierra (computer simulation)" Paragraph 3

According to Thomas S. Ray and others, this may allow for more " open-ended " evolution, in which the dynamics of the feedback between evolutionary and ecological processes can itself change over time ( see evolvability ) although this claim has not been realized – like other digital evolution systems, it eventually comes to a point where novelty ceases to be created, and the system at large begins either looping or ceases to ' evolve '.

The issue of how true open-ended evolution can be implemented in an artificial system is still an open question in the field of Artificial life.