can a 2d plane be invisible if you look at it from its side?

Question

so take a square 5 inches by 5 inches.  let's make this square blue.  it is an abstract or tangible square.  if it's an abstract square then it sits on a 2 dimensional plane.  that means if you look at it from its side, you can't see anything because it has no depth.  is this true?

second, if it's a tangible square, i guess as depth approaches 0, it gets thinner and thinner but it always has some thickness.  so if you're looking down at it from the top of the grand canyon and it sits vertical 90 degrees at the bottom of the grand canyon, you can't see it.  but it exists if something goes through it and punctures it.  is this true?

Demiurge42 · Answer

A plane is invisible since it doesn't exist in the real world.  It only exists in our imagination.

az_lender · Answer

This would be true enough if you had only one eye, or if you lined up both your eyes in the plane of the 2D object.  The thickness doesn't have to be zero for you to be unable to see the object.

lenpol7 · Answer

YES !!! Theoretically a 2-dimensional figure  has no thickness, so it cannot been seen from the 'thick' side.

A piece of paper is NOT a 2-dimensional figure. It has thickness , which can be measured. A piece of paper is a 'cuboid'.

Kitty · Answer

Sure dude I’m cool ahaha

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can a 2d plane be invisible if you look at it from its side?

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