A modular educational device includes primary and secondary modular boundary segments each having an outer shell extending to terminate at two socket ends, a plurality of modular plug-ended connectors each having two plug ends configured to mate with the corresponding ones of primary and secondary socket ends so as to enable the primary and secondary outer shell to form a loop-shaped structure that encircles an enclosed space of a certain geometric shape, and a modular support stand having a base and a pair of jaws which extend uprightly from the base and which are spaced apart from each other by a fitting space for accommodating a gripped region of the primary modular boundary segment so as to enable the loop-shaped structure to be stood on a surface.