You know how whenever you're in school, the teacher refers to a piece of paper as a "rectangle?" Well, PAPER HAS A THICKNESS! You can measure it's thickness pretty easy, too, well, at least compared to other things (like microscopic microbes or a nucleus of a cell). Or, during third grade geometry, did you ever deal with paper cut-outs of shapes, like squares, triangles, rectangles, pentagons, or any other enclosed figure with a reasonable amount of sides? Well, I propose that that harmless paper hexagon was... A HEXAGONAL PRISM IN DISGUISE! It has a width, height, and length! It's a three dimensional figure, not a two dimensional one!
To take this outrageous argument one step forward, I propose that it is impossible to create a 2D object because in our world that would require displaying the object on something that has no width, and if an object has no width, it does not exist. So in order to properly show a 2D (in real life... This is not counting on the television or computer), you'd have to draw it/print it/scratch it onto something with no width, which does not exist; therefore, it is an impossible feat!