A display system comprising an optical system, and a processing system, the processing system arranged to: combine, to produce first holographic data, first Fourier domain data representative of a first 2D image with first phase-only data representative of a first numerical lens; and provide the first holographic data to a spatial light modulator; the optical system comprising, the spatial light modulator arranged to display the first holographic data received from the processing system; a light source arranged to illuminate the spatial light modulator to form spatially modulated light in accordance with the first holographic data; a Fourier transform lens arranged to Fourier transform the spatially modulated light to produce, in the spatial domain, a first real 2D holographic reconstruction image corresponding to the first holographic data at a first replay field location; and a viewing system arranged to produce a first virtual image of the first real 2D holographic reconstruction image, wherein the viewing system comprises: an optical combiner, and a viewing lens disposed between the first replay field location and the optical combiner, wherein the processing system is arranged to vary a lensing characteristic of the first phase-only data representative of the first numerical lens to thereby cause a change in the first replay field location along the optical axis and wherein the viewing lens and the lensing characteristic of the first phase only data representative of the first numerical lens are arranged such that the distance between the first real 2D holographic reconstruction image and the viewing lens is less than the focal length of the viewing lens, whereby the viewing lens forms a first virtual image of the first real 2D holographic reconstruction image and said first virtual image is perceivable through the combiner. combine, to produce first holographic data, first Fourier domain data representative of a first 2D image with first phase-only data representative of a first numerical lens; and provide the first holographic data to a spatial light modulator; the spatial light modulator arranged to display the first holographic data received from the processing system; a light source arranged to illuminate the spatial light modulator to form spatially modulated light in accordance with the first holographic data; a Fourier transform lens arranged to Fourier transform the spatially modulated light to produce, in the spatial domain, a first real 2D holographic reconstruction image corresponding to the first holographic data at a first replay field location; and a viewing system arranged to produce a first virtual image of the first real 2D holographic reconstruction image, wherein the viewing system comprises: an optical combiner, and a viewing lens disposed between the first replay field location and the optical combiner, an optical combiner, and a viewing lens disposed between the first replay field location and the optical combiner, wherein the processing system is arranged to vary a lensing characteristic of the first phase-only data representative of the first numerical lens to thereby cause a change in the first replay field location along the optical axis and wherein the viewing lens and the lensing characteristic of the first phase only data representative of the first numerical lens are arranged such that the distance between the first real 2D holographic reconstruction image and the viewing lens is less than the focal length of the viewing lens, whereby the viewing lens forms a first virtual image of the first real 2D holographic reconstruction image and said first virtual image is perceivable through the combiner.