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Physics

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3
  • $\begingroup$ simply, it's not a perfect black object ... $\endgroup$
    – user46925
    Commented Jan 12, 2016 at 16:37
  • 1
    $\begingroup$ Black is the color we perceive in the absence of light, so it should indeed be black. To make something invisible you have to make it completely transparent - so that light behind the object can pass through it and into your eyes. However a perfect absorber would absorb any light hitting it from behind, and so not be invisible. Real objects aren't perfect absorbers, hence you can still see their texture. $\endgroup$
    – Judge
    Commented Jan 12, 2016 at 16:47
  • $\begingroup$ I think the answers given so far misinterpret the intention of the OP's question. I don't think he want's to know how black an object can be, but rather why can't we see through it. The comment by @Judge answers this. $\endgroup$
    – pela
    Commented Jan 12, 2016 at 19:16