These can be all controlled by the ghost, who can wander around the level freely and blow at things - such as the bubble to add speed, the candle to put out the flame, or switches to turn them on or off.
Ghost Whisperer | Dot-com bubble | ghost town | Ghost Hunters | Casper the Friendly Ghost | Ghost | Ghost Adventures | Ghost Dance | ghost | Space Ghost Coast to Coast | Ghost in the Shell: Stand Alone Complex | Ghost in the Shell | Tom Clancy's Ghost Recon: Future Soldier | The Ghost of a Thousand | Rolls-Royce Silver Ghost | dot-com bubble | Celebrity Ghost Stories | United States housing bubble | The Ghost of Frankenstein | The Ghost Inside | The Canterville Ghost | Holy Ghost Fathers | Ghost World | Ghost story | The Story of the Ghost | The Canterville Ghost (1985 film) | Spooky the Tuff Little Ghost | Jukebox The Ghost | Japanese asset price bubble | Holy Ghost |