Note that most other mechanisms are either foreground objects or background furniture. When such wiring objects are visible, they are not concealed by objects on any other layer. They are not visible unless the player is either wielding a mechanism-related object, or else using a Mechanical Lens or The Grand Design.
Wiring: The "wiring layer" contains Wire and Actuators these can overlap and interact with foreground or background objects, and never collide with the character or other entities. Liquids can partly or completely hide furniture-layer items they cover, as well as characters or enemies within them. With appropriate accessories or buffs, players can walk on the surface of a liquid as if it were a platform. Liquids will slow the passage of characters and most projectiles. A few furniture objects can similarly trap liquids (chests), but normally liquids can flow through background objects, perhaps breaking them in passage. Liquids: Liquids occupy their own layer: While they normally flow around blocks and can not be placed in them, blocks can be placed in liquids (except lava) and the liquid is then trapped but not destroyed. Bubble blocks act like solid blocks with respect to liquids, but otherwise as furniture items. Aside from platforms, many of the "flat surface" furniture items act like this: Work Benches, Tables, and the like. Some furniture (especially Platforms) are mainly background objects, but a character can stand on top of them (Pressing the ▼ Down key causes the character to fall through them). Doors are foreground objects when closed and background ones when open. Some objects possess qualities of both the foreground and furniture. Many background objects are for visual appeal only, though several, such as crafting stations and storage items, have functions for the player. These include the majority of plants ( trees, vines, tall grass, etc), and almost all furniture. (This is sometimes called the "furniture layer".) Characters can move through them freely. Background: A background object is something that does not collide with characters, but cannot share a tile with a foreground block. 
The Active/Inactive Stone Block has the ability to shift between foreground and background state when prompted by wire signals. Actuators can turn most foreground objects into background ones (and back again) but actuators cannot force a "native" background object into the foreground.Thorny bushes and their variants are among the few plants in the foreground, but Living Trees are also made of foreground blocks.
Doors, Platforms) that can interact with both this and the next layer. There are a few non-blocks in the foreground layer, such as Boulders and Teleporters, and a few objects (e.g. The vast majority of these are blocks, and in turn nearly all blocks are placed in the foreground layer.
Foreground: A foreground object is something that collides with the character and inhibits movement. 
A character surrounded by placed Dirt and Stone Blocks (foreground).Ī character standing over a Bookcase (background).Īs far as the player experience goes, placed items fall into several "layers" laid over the map, with a little overlap the most obvious distinction is that the first layer represents "foreground" objects that can block the player's movement, while the others represent various "background" layers, with little or no effect on the player's passage.
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