Class hierarchy in Myriad. A class cluster is a set of several block classes. A block contains a variable number of particle and binary classes. A binary is a set of two or more particle classes. A class particle contains information (mass, position, velocity etc.) for a single star and functions that act on them. The class cluster contains information about the system as a whole (total mass, energy, half-mass radius, core radius etc.) and the required functions for calculating them.