The Boxes Illusion
The point of this illusion is to show you that the small boxes are the same color. But the brain causes us to see different shades of grey with different backgrounds. When the backgrounds are removed it is clear that both small boxes are the same color shade of grey.
The Line Illusion
The point of this illusion is to fool you into thinking that the line in the middle of arrows shrinks or grows with the different shapes it takes on. When the arrows are facing out you seem to think that the line in the middle shrinks, and the opposite for when the arrows are facing inwards. But in actuallity the line never changes size.

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