Definitely 2, since the life of a cell is encapsulated by the the motion of atoms. A spheroid cell converts to a circular plane with ease. All life is comprised of cells, so a 2D plane of life without depth will likely work.
One dimension would have to resolve all interactions to waveforms with the ability to pass through solid objects. So it would probably mean violating physical laws as we understand them. Things would need to seemingly teleport to different points within the dimension, I think.
Either that, or the single dimension is reduced to binary digits, interchangeable, without identity. Then, it's not really teleportation. It's more like kinetic transfer in a newton's cradle, like croquet balls or billiard balls. Spherical cows, perhaps.
One dimension would have to resolve all interactions to waveforms with the ability to pass through solid objects. So it would probably mean violating physical laws as we understand them. Things would need to seemingly teleport to different points within the dimension, I think.
Either that, or the single dimension is reduced to binary digits, interchangeable, without identity. Then, it's not really teleportation. It's more like kinetic transfer in a newton's cradle, like croquet balls or billiard balls. Spherical cows, perhaps.