A mosquito just wanted to bite me! Päng - and it stuck to my hand, hardly recognisable anymore. I said to my girlfriend: "Just reduced the dimension of the mosquito by one!"
Therefore the question: If I squeeze a three-dimensional body really hard, will it ever become two-dimensional?
Two-dimensional means that it has a thickness of 0, so 1 atom layer is not 2D.
edit: I'd like to make this question a bit more general: Are there any real two dimensional objects or phonemes in a 3D (or 4D) world?