Editing 2.5D (section)

==Graphic design==
The term also refers to an often-used effect in the design of [[Icon (computing)|icon]]s and [[graphical user interface]]s (GUIs), where a slight 3D illusion is created by the presence of a virtual light source to the left (or in some cases right) side, and above a person's [[computer display|computer monitor]]. The light source itself is always invisible, but its effects are seen in the lighter colors for the top and left side, simulating reflection, and the darker colours to the right and below of such objects, simulating shadow.

An advanced version of this technique can be found in some specialised graphic design software, such as Pixologic's [[ZBrush]]. The idea is that the program's canvas represents a normal 2D painting surface, but that the data structure that holds the pixel information is also able to store information with respect to a [[z-index]], as well material settings, [[specularity]], etc. Again, with this data it is thus possible to simulate lighting, shadows, and so forth.