WHAT WOULD-BE CONSERVED IF THE TAPE WERE PLAYED TWICE

We develop an abstract chemistry, implemented in a lambda-calculus bas ed modeling platform, and argue that the following features are generi c to this particular abstraction of chemistry; hence, they would be ex pected to reappear if ''the tape were run twice'': (i) hypercycles of self-reproducing objects arise; (ii) if self-replication is inhibited, self-maintaining organizations arise; and (iii) self-maintaining orga nizations, once established, can combine into higher-order self-mainta ining organizations.