If you like the article, here are some videos I made a while ago, showing what might be seen by the traveler in the twin "paradox" as she leaves and returns to base (click "show more" to see the terse descriptive text): https://www.youtube.com/playlist?list=PLvGnzGhIWTGR-O332xj0s...
One of them is a 3D "Tompkins" view : https://www.youtube.com/watch?v=4lZXFXWN37M&list=PLvGnzGhIWT...
View in 1080 rez to see the clocks etc.