Click on the orange bird plate on the coffin, and if you picked up the drawing on the niche on the opposite wall, you'll start the puzzle.
Hint 2
This is what's known as a tangram. Pick up the golden pieces and arrange them in the outline at right so that they fill the entire outline without any pieces left over or overlapping.
Hint 3
Left click on a piece to pick it up and left click again to drop it where you want it to go. Right click after you pick up a piece to rotate it.
Hint 4
With the piece shaped like a slanted rectangle, if you right-click four time, it will flip as well as rotating. Handy!
Hint 5
There are lots of different ways to arrange the pieces, and any way you arrange them that they all fit is good; however, here's how I did it:
Hint 6
Hint 7
Hint 8
When you get the pieces arranged right, the coffin will open to reveal --
Hint 9
-- a skeleton, ew, and two strips of numbers that you'll need for a future puzzle --