1. A computing system comprising: one or more processors; and a non-transitory computer-readable media comprising instructions that, when executed by the one or more processors, cause the computing system to: maintain, on the computer-readable media, a hierarchical representation of a plurality of nodes associated with a corresponding plurality of objects in a virtual space, the hierarchical representation indicating hierarchical relationships between respective nodes, wherein at least some of the plurality of objects are associated with respective executable scripts, and wherein a first node having a higher position in the hierarchical representation than a second node in the hierarchical representation is associated with a first executable script; determine a modification permission for the first executable script, the modification permission obtained from a data structure associated with a second object associated with the second node in the hierarchical representation, wherein the modification permission indicates whether the first executable script is permitted to modify the second object; and execute the first executable script in accordance with the determined modification permission.