size(7.5cm,0);
import three;
for(int i; i<10; ++i)
  for(int j; j<10; ++j)
    draw(shift(2*i,2*j,0)*surface(shift(-1,-1,0)*scale3(2)*unitsquare3
                                  ^^reverse(scale3(.5)*unitcircle3),planar=true),
		 white+opacity(.5));
draw(surface(shift(0,0,-5)*scale3(20)*unitsquare3,planar=true),paleblue);
shipout(bbox(2mm,Fill(white)));