So each and every one of us (hopefully) has five senses; sight, smell, taste, touch and hearing.
Each of these senses is an input of information to the brain, and by analyzing this input of data, we are able to react and function in the world.
Consider how we (sometimes) experience dreams as if they were reality. During those dreams, things can be happening that have absolutely no grounding in reality, they can be quite surreal.
And yet we often don't question what is happening, how it is happening, or why it is happening. We just accept it as we see it because that is what we perceive with our minds. Thinking like this can lead to questions such as "which is the true dream?", that which we experience while asleep, or that which we experience while awake.
This leads to my main point; is life merely a sum of sensory feedback?
In life there is constant input to the senses, what happens if there is a lack of input?
What are we if we cannot see, smell, taste, touch, or hear?
If life is not the sum of sensory feedback, then what is it?
And of course this leads to the age old question to which we rationalists should try to crack down on producing an answer:
What is the meaning of life?
This topic is quite open to interpretation, I'm just going on what I know, and do not claim to be right in anything that I have said, I'm just trying to play "the stinging fly".