The hammocks act as a load cell, producing a signal when a force is applied, able to detect how much force and how long it has been there for. The longer people stay, the higher the balloons rise. The more people in each grid cell, the greater the spherical radius of influence. The blocks move up and down using an internal pulley system fixed to the frame, like an altered elevator system. The rope attached to the weather balloons is controlled with software using a reel, releasing the correct amount of rope as needed.