Once you progress far enough through Prince of Persia: The Lost Crown's main story quest, you will unlock a new Time Power: Clairvoyance.
 
After you unlock the power, you can press the assigned key or button to activate it.
 
Clairvoyance allows you to enter a parallel dimension of Mount Qaf, where some platforming elements and even certain enemy types appear and disappear locally.
 

You can switch back to the regular world using the same key or button.
 
The Clairvoyance Time Power ends if you fall into a trap, die or changing to a different zone.