The faint layer of hair will give the illusion of a shadow.

头发模糊的层次会产生出阴影效果。

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LinkedIn adds a very subtle shadow to the bottom of its sidebar elements to create the illusion of depth.

LinkedIn在边栏底部添加了极为细微的投影，创造出深度感。

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Before you start using regular eye makeup like eyeliners and mascara, apply white eye shadow along your lower lash line to highlight and create an illusion of puffiness.

在画日常眼妆，如眼线和睫毛之前，先用白色眼影提亮下眼线并营造出隆起的错觉。

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The biological basis for this complementary color effect is not well understood, nor is the depth of shadow, which is also an illusion.

CNN: What the brain draws from: Art and neuroscience