A pair from the group is chosen. The rest are iceburgs. One of the pair is blindfolded and stands at one end of the room with their sighted partner. The rest of the group then spread out across the play area. They should lay down, crouch down, stand up to simulte different iceburg shapes. Some of them are nominated to move. They should move very slowly as if drifting. The blindfolded player is then spun around. Their guide then has to navigate them through the iceburgs by calling out verbal commands. If they hit an iceburg they have to start again. Once they have got through, they swap places with their guide, then another pair is chosen.
Source: From the original site.(Submitted by: Nicola)