In Life is Strange: Double Exposure, Max will discover that someone has thrown a Cow Skull through Safi's window. So, she must put her sleuthing skills to the test and figure out who's done it - but the Cow Skull isn't easily accessible, so she'll need to think outside the box. Here's how to swap between the Living and Dead timelines in Life is Strange: Double Exposure to interact with the Cow Skull and find out who's been bothering Safi.
Where To Find The Cow Skull
You can find the Cow Skull after an interaction with Safi where she tells you someone threw it through her windshield. Of course, you'll need to talk to Safi in the Living World - but to figure out what's going on, you'll have to swap to the Dead timeline, since this is the only place where you can actually interact with the Cow Skull.
So, from the Dead timeline, go on stage and try to interact with the Cow Skull. Unfortunately, you're not done quite yet, since Max will point out that she's too short to reach it. Thankfully, there's a stepladder in the Living world.
So, go back to the Living world and grab the stepladder. Bring it through the portal to the Dead world, and head back up on to the stage. Here, use the stepladder in front of the Cow Skull so Max can climb up and reach it.
How To Examine The Cow Skull
You've reached the Cow Skull, so now it's time to take a good look at it. Interact with it using the 'Inspect' button - then, rotate it around. You should notice some weird writing on one of the skull's two horns.
Interact further to discover that the skull has actually been signed by Lucas Colmenero, who, as you may remember, heads the Literature department at Caledon. A pretty strange discovery...
Now that you've interacted with the Skull and seen the strange writing, it's time to do something with that information. Head back to the Living timeline and chat it up with Amanda for some further details.