Comet Hale-Bopp is definitely a case of this for me. Although I remember a few interesting things about the process of seeing it, I have no idea of what it looked like to me.

I can remember the neighbors standing slightly in our yard and then explaining to my parents the comet and pointing it out to us. I can remember at some points that followed being aware of the parallax effect as it seemed to appear on either side of my other neighbors’ house as I walked up and down the driveway.

But just a year or so later, I knew that the picture in my memory was more like an illustration of a comet. The accurate image was completely gone even though the memories surrounding it remained, and in the place of that image was something that I had imagined.