There is a small niche on the side of the wall with the skeleton painted on it go there and look left.You should see the place where to put the crystal.In the big room I had problem with it too, later on (whole game in fact) I learned to use all my preception skills to look for that f***** levers, buttons and niches that are the same colour as the wall and its very hard to find them.Hope it helps
Erad
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