Jump to grab one of the lowest handholds on the side of the tower and wait until the ring above rotates and brings the next handhold. Jump to grab it and again wait until the next ring above brings a horizontal pole above. Jump to grab the pole and climb to stand on it.

Approach the tower and wait for a narrow ledge to pass above Lara's head. Jump to grab it and pull up to hug the wall.

When another pole passes above Lara's head, jump up to grab it. Traverse away from the tower until you reach the middle of the pole.

Climb on the pole and jump to grab the circular ledge above; pull up. Carefully go around the ledge and pick up a Health Potion.

Now find the symbol that glows when Lara is nearby. Grab onto it and move to the left, rotating the ring at the same time. When the symbol reaches the same one designed on the floor, a second ray of light falls from the ceiling in front of the door.