Permanent URL: https://mezzacotta.net/postcard/?comic=2130
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The author writes:
I've gotten a few emails asking how I manage the special effect of Preston appearing in the same panels as his past self. It's actually quite easy; I draw each Preston separately, and use editing software to merge the two drawings so it looks like they're both there at the same time. They can even interact with each other, but those scenes are difficult to coordinate.