Perplex City Postcard

Jonas from the Unfiction forums picked up this postcard in Bologna Airport, and oneliiivewire got one from Chapel Hill, NC (Thank Jonas and oneliiivewire for the pics)

Speculation

• The code below the Semacode means something.
• The PCPS maze may have meaning.
• Postcard Discussion on unFiction.

Content

• Painting of Perplex City at night.
• On the Image of the building on the painting, the windows convert to "helloworld" from binary.
• Letter from Sente.
• Semacode pointing to Perplex City
• Code of 221545484848465100503215 - Postcard Code
• A line "Mc, Please expetite global release. S"
• A stamp with a maze and "PCPS" in the centre
• Text down the middle: "Despite hightened security Academy tours are still running twice daily from gatehouse twelve. Advanced booking essential."
• A full Perplex City Academy crest.

Puzzles

• Postcard Code

Letter on Postcard

My friends -

I need your help.
Cube - Missing.
Presumed Stolen.
Not enough room to 
explain here.
Too risky.
Your assistance will
be rewarded.
More contact to 
follow - stay alert.
Yours in hope,

Sente

Postcard - Front

Postcard - Back

Postcard 1

Postcard 2

Edited Versions

Possible Sente Sig

Sente Sig Clear Version

Postcard Sig Clear

Composit of Sigs (by EclecticMunk)

Postcard Semacode

Edited Logo

Maze

Adjusted version of the front

Adjusted version of the back