The historical introduction of the curtain as a stage element in Indian theatre is primarily attributed to the influence of ancient Greek theatrical practices.
Ancient Greek theatre featured specific stage elements and conventions that influenced theatre traditions across various cultures through historical interactions and cultural exchange.
Elements of stagecraft, including the use of curtains, were part of these Greek theatrical conventions. As Hellenistic culture spread and interacted with Indian culture, these theatrical innovations were adopted.
Therefore, the Greek influence is recognized as the primary factor behind the curtain's entry into Indian theatre.