Say I have a texture like this: 
#declare Texture1 = texture { //Reddish
    pigment { color rgb <0.790, 0.000, 0.000>
        } // pigment;
    normal { 
        boxed 
        normal_map {
            [ 0.250 bumps turbulence 0.2 ]
            [ 0.750 crackle turbulence 0.3 ]
            } // normal map
        scale <0.2, 0.1, 0.3>
        } //normal
} //texture

Normally, if you use a single pattern in a normal you need to
enter an amount. Like this:
#declare Texture1 = texture { //Reddish
    pigment { color rgb <0.790, 0.000, 0.000>
        } // pigment;
    normal { 
        boxed .25
        scale <0.2, 0.1, 0.3>
        } //normal
} //texture

However, is the amount required for normal maps? Is it optional?
I rendered an image with a normal map, with the amount and
without the amount and got no errors. So I guess it's optional,
but legal to use.

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