If you open my chest, then go to the left, you'll find my heart. Often, you can find happiness, disagreement, surprise and a bit of sadness.
If you open my chest, then go to the left, directly to my heart right now, maybe you'll find darkness. The type of darkness that you'd found in a night without moon or stars, the darkness of the night sea. Perhaps you would see nothing.
It will be very hard for light to illuminate such a dark place again.