BoxGizmo lets you create a box-shaped gizmo in your scene. Clicking the BoxGizmo button displays the Box Gizmo Parameters rollout.

Box gizmo with volume fog
Modify panel
Atmospheres & Effects rollout, click Add. This displays the Add Atmosphere dialog.
To add an existing atmosphere:
Modify panel
Atmospheres & Effects rollout, click Add. This displays the Add Atmosphere dialog.
This creates a duplicate atmosphere for the apparatus. Its settings are initially identical to the atmosphere you chose. You can adjust them using Setup.
The Name and Color rollout lets you rename objects and change their wireframe color.

The Atmospheres & Effects rollout, available from the Modify panel, allows you to add and set up atmospheres directly to the gizmo.
Displays the Add Atmosphere dialog from which you can add an atmosphere to the BoxGizmo.
Displays the Environment panel, where you can edit the highlighted effect.