All actors are refreshing objects, inheriting from MRefreshable. All refreshing objects are known by the single refresh thread, which redraws the objects when it sees fit.
The TRefreshThread class implements a thread that periodically refreshes an offscreen buffer to reflect the current state of the simulation. There is
only a single instance of this class owned by the TUniverse instance. The MRefreshable class defines an abstract protocol for use by instances of the TRefreshThread class.
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