A projection or back-projection method according to which a glazing comprising two main external surfaces (10, 20), used as projection or back-projection screen, and a projector are available, said method consisting in projecting, by virtue of the projector, images viewable by spectators onto one of the sides of the glazing, characterized in that said glazing comprises a transparent layered element having two smooth main external surfaces (2A, 4A), characterized in that the layered element comprises: - two external layers (2, 4), which each form one of the two main external surfaces (2A, 4A) of the layered element and which are composed of transparent materials, dielectric materials, having substantially the same refractive index (n2, n4), and - a central layer inserted between the external layers, this central layer being formed either by a single layer which is a transparent dielectric layer, with a refractive index different from that of the external layers, or a metallic layer, or by a stack of layers (3 1, 3 2,..., 3 k) which comprises at least one transparent dielectric layer, with a refractive index (n3 1, n3 2,... or n3 k) different from that of the external layers, or a metallic layer, where each contact surface (S 0, S 1,..., S k) between two adjacent layers of the layered element, one of which is transparent with a refractive index (n2, n4, n3, n3 1, n3 2,... or n3 k) and the other metallic or which are both transparent layers with different refractive indices, is textured and parallel to the other textured contact surfaces between two adjacent layers, one of which is transparent with a refractive index (n2, n4, n3, n3 1, n3 2,... or n3 k) and the other metallic or which are both transparent layers with different refractive indices and at least a variable light scattering system comprising a functional film capable of switching between a transparent state and a scattering state, the variable light scattering system comprising the functional film extending over the entire surface of the glazing or over at least a portion of the glazing, when the variable light scattering system extends over at least a portion of the glazing, this portion of the surface corresponds to and is aligned with the portion of the surface of the glazing comprising the layered element. a transparent layered element having two smooth main external surfaces (2A, 4A), characterized in that the layered element comprises: - two external layers (2, 4), which each form one of the two main external surfaces (2A, 4A) of the layered element and which are composed of transparent materials, dielectric materials, having substantially the same refractive index (n2, n4), and - a central layer inserted between the external layers, this central layer being formed either by a single layer which is a transparent dielectric layer, with a refractive index different from that of the external layers, or a metallic layer, or by a stack of layers (3 1, 3 2,..., 3 k) which comprises at least one transparent dielectric layer, with a refractive index (n3 1, n3 2,... or n3 k) different from that of the external layers, or a metallic layer, where each contact surface (S 0, S 1,..., S k) between two adjacent layers of the layered element, one of which is transparent with a refractive index (n2, n4, n3, n3 1, n3 2,... or n3 k) and the other metallic or which are both transparent layers with different refractive indices, is textured and parallel to the other textured contact surfaces between two adjacent layers, one of which is transparent with a refractive index (n2, n4, n3, n3 1, n3 2,... or n3 k) and the other metallic or which are both transparent layers with different refractive indices and - two external layers (2, 4), which each form one of the two main external surfaces (2A, 4A) of the layered element and which are composed of transparent materials, dielectric materials, having substantially the same refractive index (n2, n4), and - a central layer inserted between the external layers, this central layer being formed either by a single layer which is a transparent dielectric layer, with a refractive index different from that of the external layers, or a metallic layer, or by a stack of layers (3 1, 3 2,..., 3 k) which comprises at least one transparent dielectric layer, with a refractive index (n3 1, n3 2,... or n3 k) different from that of the external layers, or a metallic layer, at least a variable light scattering system comprising a functional film capable of switching between a transparent state and a scattering state, the variable light scattering system comprising the functional film extending over the entire surface of the glazing or over at least a portion of the glazing, when the variable light scattering system extends over at least a portion of the glazing, this portion of the surface corresponds to and is aligned with the portion of the surface of the glazing comprising the layered element.