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import three;
import palette;
size(20cm);
currentprojection=orthographic(1,1,1);
draw(box((-2,-2,-1),(2,2,1)));
draw(shift(-Z)*surface(box((-2,-2),(2,2))),blue);
draw(shift(Z)*surface(box((-2,-2),(2,2))),orange+opacity(0.5));
surface s=unitsphere;
s.colors(palette(s.map(zpart),Gradient(green+opacity(0.6),white,
green+opacity(0.6))));
draw(shift(0.5X+0.5Y)*s);
draw(shift(-0.5X-0.5Y)*s);
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