% --- start of displayed preamble in the book ---
input metafun
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
draw unitsquare scaled 1.5cm
randomized (1mm,2mm);
draw unitsquare scaled 1.5cm
squeezed (1mm,5mm)
shifted (3cm,0);
endfig;
end;
