This page of the guide to Death Stranding has information on how to create holograms and play music near the structures. These changes are purely visual that can be seen by other players.
If you are playing online, you can find the structures of other players. Some of them may include holograms and music. These modifications don't affect the structures, but they can make using them more pleasant.
You can add holograms and sounds to your structures, too. This becomes possible after you upgrade a specific structure to level two or higher. This means that, in addition to using PCC to build a level one item, you need to provide additional crafting materials to improve it (Upgrade Structure option in the object's menu). The required materials are always displayed on the right - in our example, upgrading the Timefall Shelter required 32 Chiral Crystals and 400 units of metal.
Once a structure is improved, interact with it again and select Customize Structure option.
You can set:
- Music - You can unlock more songs as you progress through the campaign.
- Short messages - They can, for example, greet other players or warn them about nearby dangers.
- Holograms - There are two tabs - "regular" and rare holograms. You can gain rarer variations of them, for example, by completing orders and increasing the level of affiliation (stars) with the main locations of the game world.