box in box by solus

s,t=0,['\n']*1721\x0d
for w in 8,6,4,2:\x0d
 r=range(41-2*s)\x0d
 for y in r:\x0d
  for x in r:t[(y+s)*42+s+x]=['  ','[]'][y%w==0 or x%w==0]\x0d
 s+=w\x0d
print''.join(t),

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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