I did some Fesnel messing around a bit yesterday, and found if you turn the duffuse low then it becomes transparent if you turn it high it becomes more opec. (or whoever you spell it). At 1 it 'seemed' to be completly solid, but the jury is still out on that. Also I found that refraction indexes below 1 tend to look more like a glass ball over 1 looks more matalic. (to me atleast) Does anyone really know the proper way to use this node outside of what it says in the (near non-existant) paragraph in the manual?