Hehe ... I asked this myself ...
The Heaven is blue ...
so the most ambient is blue ...
The sun is yellow ...
so where the sun hits the sphere, there is the ambient and the sun
(blue + yellow) that gives white ...

The shadow of the sphere, that is not lit by the sun is blue, because
of the ambient ...
below the sphere there is no ambient, but the sun brightens some parts
...
so it gets yellow ...

You understand ?

--
background{rgb 1}camera{location<1,5,-2>look_at 0}#macro
m(a,b,i)#local d=(b-a)
/8;#local
e=vcross(d,y);#if(i)m(a-e,a+e+2*d,i-1)m(a+e,a+2*d-e,i-1)m(a+3*d-e,a+e
+3*d,i-1)m(a+3*d-e,a+5*d-e,i-1)m(a+6*d-e,a+e+6*d,i-1)m(a+8*d-e,a+e+8*d
,i-1)#else
cylinder{a,b,vlength(d)/3 pigment{rgb 0}}#end#end m(-4*x,2*x,4) // Jan
Walzer

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