swarm lure. A hole saw was used to create two entrances - one that you can see and another on the bottom side. I don't want to use foundation, but the non-level box is not suitable for foundation-less frames. It's too good to be true, this swarm did not demonstrate any comb building behavior beneath the box. After an hour, everyone was inside. It rained last night. I'm glad they stayed dry and are presumably busy drawing comb.