[Lampion]

From Sinjin's Oddworld: Abe's Oddysee walkthrough:

...Keep running to the next room and jump to the ledge on the right side. You are safe for now so breath.

The lever you stand by opens both trap doors below. Wait for the Scrab to stand on one then yank the lever to dispose of half of your problems. Now it's raining boulders. Standing on the right edge, wait for a rock to pass in front of you then jump to the right. Now wait for the next rock to pass and jump over the gap. Pull the lever to stop those annoying rocks and open the exit. Jump back to the left and enter the door. Finally, chant to open the bird portal.

http://www.sinjinsolves.com/guides/oddworld/oddwalk.htm