Not sure how your buildings are built over there so this may not apply. But an exhaust fan for the space between the ceiling and roof does wonders to cool a house after a hot day. Those attic spaces get crazy hot and hold the heat well after the sun sets and it keeps your house hotter longer. This wonβt necessarily help with mid day heat, but help cool the living space as the sun goes down.
I would put one portal on a pneumatically actuated plate above a dais that holds an object, and the other portal on a plate placed at a 45 degree angle. I would then see if an object on the dais would fly or fall out of the 45 degree portal, if the other portal actuated and closed the distance between its starting point and the dais.
The Pac Man episode of Secret Level
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