Thermometer

The Thermometer is an indicator in LittleBigPlanet's Create Mode, that notifies the player how 'full' their level is. As items and stickers are placed in the level, the thermometer rises. Once the thermometer becomes full, the game disallows the player to add any other items until current ones are deleted.

The Thermometer exists to prevent players from using up more RAM than the system has. If the thermometer didn't restrict the player when it is overheated, the game would overwrite the first chunks of memory and crash the system - resulting in a loss of data (and possibly corrupting the user's HDD).