Given the task definition and input, reply with output. Given a text, write a compressed version of it in a single sentence.

Vygotsky concluded that make-believe play has two crucial features that distinguish it from other childhood activities. First, the creation of imaginary situations in play helps children separate internal ideas from the objects and events for which they stand.
Vygotsky stated make-believe play has features that distinguish it from other activities. The creation of imaginary situations helps children separate internal ideas for which they stand.