This is my Physics project, can you explain the Physics behind it? 3. Fashion a

Question

This is my Physics project, can you explain the Physics behind it?
3. Fashion a cardboard tube covered at each end with metal foil. Punch a hole in each end with a pencil,
one about 3 or so millimeters in diameter and the
other twice as big. Place your eye to the small hole
and look through the tube at the colors of things
against the black background of the tube. You'll see
colors that look very different from how they appear
against ordinary backgrounds. This is from Conceptual Physics, Hewitt 10th edition. My original thought was that since there is no light, the object will not reflect anything appearing black, but the last sentence says otherwise.
This is my Physics project, can you explain the Physics behind it?
3. Fashion a cardboard tube covered at each end with against ordinary backgrounds. This is from Conceptual Physics, Hewitt 10th edition. My original thought was that since there is no light, the object will not reflect anything appearing black, but the last sentence says otherwise.

Explanation / Answer

I would have thought the same I am not sure! Sorry good luck!

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