Churchill famously said, "The depression in my heart is like a black dog. It bites me every chance it gets. " After Churchill, black dogs became synonymous with depression in the English-speaking world. In modern society, depression has become the invisible killer of this century. I don't know how many people cry in the dark and dare not admit that they have depression.

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If white symbolizes light, then black represents darkness. We will use white to describe angels, but black will only be left to the devil. In western countries, black has long been associated with people's negative emotions, such as sadness, depression and despair. Black also symbolizes death, and mourning clothes in western countries are all black. Imagine a world with no color but black. For people with depression, suffering from depression is like being in the "darkest moment" in life. They try to find hope in the dark, but they may live in the dark forever until the end of their lives.