Why does it look like the skin in our fingers goes together

Why does it look like the skin in our fingers goes together when we get them really close?Like if youre putting your index finger and thumb super close, but not touching. It looks like the skin is reaching out to grab it. Why does it do that......

Why does it look like the skin in our fingers goes together when we get them really close?
Like if you're putting your index finger and thumb super close, but not touching. It looks like the skin is reaching out to grab it. Why does it do that?
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answers:
CantHaveItBothWays say: The light rays behind them bend and cross each other before entering the eye.
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