Focus Loci, the locations of thefocus, are the game elements through which players can affect the game state. The most obvious Focus Loci are the game elements that can be moved by the player, and the actions they provide are the possibility of moving them.
Example: Each piece in Chess acts as a Focus Loci for the players by providing a number of potential actions.
Example: The stones used in Go are only Focus Loci when they are being placed on the board, since players cannot perform any other actions through them later.
Example: Various types of mouse cursors used in real-time strategy games and Sims games are Focus Loci that allow players to move between units and characters, which in their turn are also Focus Loci.
The four main options for Focus Loci are Avatar, Units, Characters, and God's Fingers. The first three can maintain a Consistent Reality Logic, but the actions they provide are then restricted by the Alternative Reality of the game. They also allow points within the game for players to have Identification with. The use of Characters allows players to have Focus Loci without the need for Game Worlds. The use of several Focus Loci through Units allows single players to simulate Team Play but requires Attention Swapping and Status Indicators to show where the Focus Loci are in the Game World. As the swapping between Units is often done by explicit actions performed from a Third-Person View, this Third-Person View can actually be seen as a form of Focus Loci. God's Fingers are most often used to allow players to have Game State Overview and to let them do Attention Swapping between other Focus Loci but can be used to provide the god-like actions found in god games.
Although not as common as the three main options, Cards can, especially in collectable card games, be Focus Loci either when being played or by being in play and giving a player New Abilities. Book-Keeping Tokens whose presences indicate that a player has New Abilities are another form of more unusual Focus Loci. Dice are seldom Focus Loci except in pure dice games, since using them is not usually an activity affecting the game directly but rather determining how actions are to be performed.
Focus Loci are game elements within Game Worlds thatprovide methods for players to affect the Game Worlds. Focus Loci can affect the Game World usually by affecting themselves, other game elements, or the environment in their immediate vicinity, for example, to gain Area Control in the latter case. These Focus Loci support Cognitive Immersion, and in some cases, Spatial Immersion. The Focus Loci that are not defined as part of the Game World primarily support Cognitive Immersion but can also support Sensory-Motoric Immersion.
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