Contest #2 - Puzzling Puzzles

A new Principia building contest is now live.

For more details see the the contest's page. This forum thread acts as a longer form discussion board than the contest comments section.

Unfortunately the amount of contest entries was much lower than I expected. I don't really feel okay with declaring any winners for a contest that ended up only having one entry submitted, so I have decided to just call off the contest without a winner.