Why is this relevant to our research?

It is important to note that the human eye and brain can easily be deceived. Sometimes we think that we see things which are just not there, such as movement, shapes, lights etc. In particular we also see things when we are in the dark and our senses are heightened.
When we are tired this can also have this same effect.

This is not however dismissing that paranormal activity is happening
in anyway shape or form. The pictures above are simply just fun examples of how
our eyes and brain can be fooled in different situations.