In Swarm, spaces are really just another kind of agent. In the heatbugs model we create a HeatSpace, a subclass of a diffusion object from the Swarm space libaries (specified in HeatSpace.m). Here is the code from buildObjects in the HeatbugModelSwarm.
heat = [HeatSpace createBegin: [self getZone]];
[heat setSizeX: worldXSize Y: worldYSize];
[heat setDiffusionConstant: diffuseConstant];
[heat setEvaporationRate: evaporationRate];
heat = [heat createEnd];
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the object is created, a few parameters are set, and then the creation is finalized.