In our physical world, it is not possible to create a truly one-dimensional object. The concept of "one dimension" refers to a line or a path with no width or height, only length. In practice, even the thinnest objects we can perceive or create, such as a wire or a string, have some thickness or depth, making them three-dimensional.
However, in mathematics, we often use the concept of a one-dimensional object to simplify certain theoretical models and calculations. For example, a straight line is considered one-dimensional in geometry. In physics, we might use the concept of a one-dimensional object to study motion along a single axis, such as the movement of a particle along a straight line.
So while we can use the idea of a one-dimensional object in mathematical and theoretical contexts, we cannot create or observe a purely one-dimensional object in the physical world as we experience it.