I've seen cels that look exactly like ones I 
have, so close that I had to get out my cel and 
compare closely for a couple minutes to see the 
tiny tiny differences.

For example I have a cel from Escaflowne of Van 
about to skewer the dragon from Ep. 1; I have 
seen two others from the same sequence, very 
close, with only slight changes.  I have found 
one of the others I have seen for comparison: 
note the one on the right IS NOT MINE!  Apologies 
to whomever bought it, this is displayed here for 
educational purposes only.

These are very similar (aside from the 
obvious "one has background" and color changes 
from being scanned on two different scanners: but 
they are not the same cel.  

Feels like a kid's puzzle in the newspaper --
 "Count the differences!"

Quat(s)