The Open Architecture is a treasure in the PAL version of Pikmin 2, where it is actually an empty can of salmon. It is found in the Citadel of Spiders, on sublevel 3. Yellow Pikmin are of great usefulness here, amongst the Anode Beetles and Swooping Snitchbugs. This particular treasure is most often found out in the open in one of the main rooms, easy to locate and collect once the enemies have been dealt with.