 As moving objects pass through portals, they come through the exit portal at the same direction that the exit portal is facing and with the same speed with which they passed through the entrance portal.For example, a common maneuver is to jump down to a portal on the floor and emerge through a wall, flying over a gap or another obstacle.This allows the player to launch objects or Chell over great distances, both vertically and horizontally, referred to as 'flinging' by Valve.