With the flip of one switch, they all come to life and boot off floppies in the internal drive. Specially written software on each disk starts an animation sequence that plays on each of the Mac's screens, creating one enormous, animated mosaic!

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... and then, the heat from all those Macs without fans, especially on the bottom levels which vents are blocked, cause a massive display of smoke and sparks as the internals of each one overheats and fails in any number of the myriad of ways a compact mac can fail. Aside from the ozone-smell, the collection will revert to the state it was in before the flip of that power switch.