The document describes the steps taken to create a portal effect using After Effects. It involves: 1) Creating dark solids and applying CC Particle Systems 2 to add particles with a birth rate of 3 seconds and longevity of 3 seconds. 2) Adjusting the position and size of the solids using the producer setting and applying explosive physics with a velocity of 0.2. 3) Altering the particle type to lines with a birth size of 0.15 and death size of 0.75, and setting the color to yellow and the transfer mode to composite. 4) Looping the effect continuously to simulate an open portal.