# Decorative Objects
In the 3D Scene, it is possible to add 3D objects that do not act as Screens. These 3D objects can be used to represent technical equipment, set elements, seating, or other props that are part of the real-world stage space, without being used as Projection Surfaces.
By default, TACHYON consider any 3D object added in the 3D Scene module as a Screen. These objects therefore appear automatically in the timeline module.
If 3D objects are not a projection surface, it can be declared as Decorative Objects.
{% hint style="info" %}
As Decorative Objects these 3D objects will NOT be shown in the Timeline module, and will NOT be taken into account for computations related to video projection.
{% endhint %}
## Declaring a Decorative Object
1. Select the 3D object by clicking on its entry in the Scene Primitives list.
2. Press **`P`** on the keyboard or select **{Options Panels > Properties}** from the 3D Scene module’s menu to open the Properties Panel.
3. Click on the first dropdown menu in the **{Display Options}** section of the Properties Panel to change the default option from **{Projection Surface}** to **{Decorative}**.
