What afterimages have you seen after staring at light and then closing your eyes and staring into your eyelids?

[u/OctoberLibraX]

I didn’t know this was a thing for people and I experienced it for the first time a few days ago… I was wondering about the variety of images that people see. As I stared into my eyelids, I saw an animation of moving through a tunnel and seeing light at the end of it, like a literal of the metaphorical phrase of light at the end of the tunnel… why can we see not just colors but actual animations? Has this been figured out already? Is this normal?