# bound_height var (movable atom)

Source: https://ref.dm-lang.org/atom/movable/var/bound_height
Added in BYOND 490.

### Default value
> 32 (depends on world.icon_size)

This var defines the height of the physical atom's bounding box, in pixels. By default all atoms are assumed to be one tile in physical size.

Example: A 16×16 smiley face centered in a 32×32 icon should have a bound_height value of 16.

The default value depends on world.icon_size and world.map_format. In a topdown or tiled map_format, the icon height specified in world.icon_size is used. In other modes, height is irrelevant and tile "footprints" are square, so the icon width is used.

### See also
- [bound_x var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_x.md)
- [bound_y var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_y.md)
- [bound_width var (movable atom)](https://ref.dm-lang.org/atom/movable/var/bound_width.md)
- [icon_w var (atom)](https://ref.dm-lang.org/atom/var/icon_w.md)
- [icon_z var (atom)](https://ref.dm-lang.org/atom/var/icon_z.md)
- [step_x var (movable atom)](https://ref.dm-lang.org/atom/movable/var/step_x.md)
- [step_y var (movable atom)](https://ref.dm-lang.org/atom/movable/var/step_y.md)
- [locs list var (movable atom)](https://ref.dm-lang.org/atom/movable/var/locs.md)
- [icon_size var (world)](https://ref.dm-lang.org/world/var/icon_size.md)
- [map_format var (world)](https://ref.dm-lang.org/world/var/map_format.md)
- [Pixel movement](https://ref.dm-lang.org/notes/pixel-movement.md)