That giant foam structure that could be seen this morning between the Atwood Center and the Performing Arts Center was not a display. The St. Cloud State Public Safety office says it’s a prank, and an act of vandalism. The St. Cloud State Public Safety office says the pranksters likely dumped mass amounts laundry detergent in the fountain to create the foam. Besides the mess it creates, Public Safety says the practical joke can be very costly, because it can ruin the water circulation system.