The conversation between human and AI assistant.
Is there a logical explanation for me seeing a "running" shadow in the middle of a crowded subway platform that was unnoticed by anyone?
No, I haven't. But is it possible for something like that to happen?
Yes, it's possible. Optical illusions and strange shadow play can be caused by factors like the angle of the sun and the position of objects. It's always best to investigate further to determine the cause.