In my first theme of prompt, I had the same observation (even running same prompt at first) not until my second round of experiments. When I run the same prompt over and over again, it produces an uncanny similarity, but I did not pay attention at first. When I did take a closer look at the images, I find it somehow related to the first, but with all the iteration, only this set (shown in the blog) has a recognizable timeline. For now, I think it is coincidental and maybe due to running countless loop for a the same prompt. Maybe, as we explore this AI models, we can find new peculiarity in the output.