The brain is, of course, a very complex structure receiving input from five - at least - main senses simultaneously: this occasionally causes it to be confused! An interesting example is the phenomenon of pareidolia. This is when our mind searches for familiar patterns in the images it receives from our eyes. When we were children, I imagine we all looked for patterns in the clouds. In Catholic countries people frequently report finding the face of Christ in a piece of toast or stain on a wall.
This morning, as the Sun briefly shone through our lounge curtains, a pareidolic image of a Saturn 5 rocket taking off appeared on the wall!
I also add an amusing 'alien tree' that I walk past during my exercise!