The chambered nautilus is one of the oldest creatures known to survive in the earth's oceans. As a symbol, the nautilus shell is used as a metaphor for an individual’s spiritual growth. The way the nautilus moves forward into new chambers as soon as a bigger one becomes available is highly symbolic of humanity’s quest to expand its knowledge. A nautilus knows not to return to old, smaller chambers because they no longer fit in there. It mirrors how we as humans are not supposed to crave the way things were, because we no longer belong in the past. We must always look forward and move on to better things that will serve our purpose better.