How Was This Three Coloured Bevelled Rounded Rectangle Achieved?

[iamtheblues]

Having given this some more time, the original bevelled rectangle is only made up of 2 colours. If you examine the 2 seemingly different blues, they are in fact, caused by the placing of the lightsource.
If the arrowhead is moved 45º, the outer blue part of the bevel will be more easily seen as the same colour as the inner part of the bevel. It's that simple! Fred is right too, of course. It's all an illusion, anyway!
Looking from top to bottom, the outer parts of the bevel turn from dark to light and the inner parts of the bevel turn from light to dark - they are both the same colour. PS: I like the new avatar, Fred.
Saludos,
Bob.