Allegories are key elements of poems and pictures; allegories disclose hidden messages by way of relationships between seemingly unrelated concepts.
A example of an allegory is Plato's cave, written by the Ancient Greek Philosopher Plato.
In Plato's book 'The Republic', Socrates reveals the most perfect and famed metaphor ever to be found in western philosophy.
Socrates describes a cave where a group of prisoners live chained to the cave wall.
Their whole lives , up until this point, consisted of them chained in place, unable to move their heads, gazing at the passing shadows projected onto the caves wall from a campfire behind them, and believing that these shadows were reality, existence, life, and all the universe had to offer.
One of the prisoners escapes there bonds, and turns around to realize that the shadows have only ever been a manufactured and false representation of reality, and from that moment on understands the truth behind existence.
Excited and worried for the other prisoners, they rush back to the cave wall to try to make the other prisoners understand and free them from their delusions.
However, unable to explain by finding the right words, expressions, or examples, the other prisoners reject the freed prisoners enthusiasm , and continue their gaze towards the manufactured shadows. Because they truly enjoy their captivity and are unable to understand anything different.
The escaped prisoner, now the philosopher, walks alone to encounter a "new realm", and even though the road is hard, with new wonders but also nightmares within, they are still truly free.