"Now take care," said Krishna. "Maya mixes his blessings. Let me lead the way."
The Pandavas followed Krishna up the stairs. "Is it dangerous?" asked Arjuna.
Krishna replied over his shoulder, "Not exactly, but..." With a crash Krishna walked straight into a closed door of clear crystal, and stood back rubbing a bruise on his head. "See? That's the sort of thing not to do..." Krishna was pushing at the door. Then he gave up and went to a smaller doorway next to it. "I'll get in, or else!" He stepped up, pushed, and fell right through.
Krishna lay on the beautiful floor. "Well, come in. There is no door here, just empty air." (Buck, p.88)
Buck, William. Mahabharata. Berkley: University of California Press, 1973.