The invention relates a billboard, a plurality of patterns of which can be observed from a plurality of different positions respectively. The billboard comprises a substrate and a two-dimensional lens array, wherein the substrate comprises a plurality of pattern units arranged therein; the two-dimensional lens array is arranged on the substrate, and comprises a plurality of adjacently arranged two-dimensional lenses; each two-dimensional lens comprises a light emergent plane formed away from the substrate and a light incident plane which is in contact with the substrate; the light emergent plane is a cambered surface which is formed by enclosing a pair of first arc-shaped edges parallel with each other and a pair of second arc-shaped edges parallel with each other; the light incident place can be divided into a plurality of parts; and the plurality of pattern units are corresponding to the plurality of parts of each light incident plane respectively, so as to allow the observer on theside of the light emergent plane of the two-dimensional lens array to observe the plurality of patterns selectively combined by the plurality of pattern units from the plurality of different positions through the light emergent plane.