I don't understand why all explanations of time dilation and experiencing time differently at different speeds use light clocks in the explanations, but I'm also retarded.
If God or an all-knowing outside observer were keeping time, would the examples still hold, or does light need to be involved

https://www.youtube.com/watch?v=js1myWkrv8Q
https://www.youtube.com/watch?v=Txv7V_nY2eg
https://www.youtube.com/watch?v=nJkdUrBLm0w