Practice moving about the room with your cursor. In order to accomplish this and to reach the statues, you'll generally need to go forward to the center and then turn in the direction you wish to go. You want to reach all four statues. That's the bottom line. When you have done this you will hear a click that indicates the opening of a panel in the floor over near the door where you came in. Pick up a fourth Anubis statue in the niche you will see there. Be sure to check out the riddle on the door to the right and rear of the room. Read the riddle, in close up.
(Note: While you are moving around the room, you may notice chains on the left wall and a large metal ring in the center of the ceiling. Don't worry about it now, but its an intriguing arrangement, right?)
Leave the rotating room and go back across the lab to the storage room. Use the "B" Brahman seal from your inventory on the center urn standing on the floor. The seal will disappear into the urn and Sherlock will comment that Brahman may be the key to the mystery. Brahman means "truth."
Go back to the rotating room. Just inside the door, turn and click toward the center of the room. Turn and click forward to the center of the room three more times (4 total). Next, click between the two appropriate statues while having the far door which you wish to open behind you. You will then be able to access the far door and, in close up, read the sign:
It's better than God.
It's worse than the devil
Poor get plenty
Rich people need it
If you eat it, you die.
This riddle may have lost a bit in the translation to English, but the answer is "truth" (Brahman) or "nothing." Nothing makes a lot more sense in the context of the riddle.
You've already sequestered the Brahman seal, so back out of the close up and click on the door latch to open it.