A method for providing a substrate, the substrate initially comprising: a plurality of lines of deposited material, extending in a substantially parallel manner, there being a pitch for the spacing between lines of deposited material, the deposited material having a different colour to the substrate; the method comprising: providing, in the substrate, a plurality of embossed grooves extending in a substantially parallel manner, there being a pitch for the spacing between the embossed grooves, such that the plurality of lines of deposited material are provided in the vicinity of the embossed grooves; in a background region of the substrate to be presented to a viewer of the substrate, there being a fixed positional relationship between the substantially parallel embossed grooves and the substantially parallel lines of deposited material, such that the region presents a first background to a viewer of the substrate when viewed from a first angle, and such that the region presents a second background to a viewer of the substrate when viewed from a second angle, the first and second angles being defined as angles on either side of a perpendicular to that substrate and in an image region of the substrate to be presented to a viewer of the substrate, there being one or more deviations from the fixed positional relationship to provide a first image feature against the first background when viewed from the first angle, and a second image feature against the second background when viewed from the second angle, and characterised in that, if the one or more deviations are in the line or lines of deposited material, each of the one or more deviations is lesser in extent than the pitch of the embossed grooves, and for a majority of that region of the substrate; or if the one or more deviations are in the embossed groove or grooves, each of the one or more deviations is lesser in extent than the pitch of lines of deposited material for a majority of that region. a plurality of lines of deposited material, extending in a substantially parallel manner, there being a pitch for the spacing between lines of deposited material, the deposited material having a different colour to the substrate; the method comprising: providing, in the substrate, a plurality of embossed grooves extending in a substantially parallel manner, there being a pitch for the spacing between the embossed grooves, such that the plurality of lines of deposited material are provided in the vicinity of the embossed grooves; in a background region of the substrate to be presented to a viewer of the substrate, there being a fixed positional relationship between the substantially parallel embossed grooves and the substantially parallel lines of deposited material, such that the region presents a first background to a viewer of the substrate when viewed from a first angle, and such that the region presents a second background to a viewer of the substrate when viewed from a second angle, the first and second angles being defined as angles on either side of a perpendicular to that substrate and in an image region of the substrate to be presented to a viewer of the substrate, there being one or more deviations from the fixed positional relationship to provide a first image feature against the first background when viewed from the first angle, and a second image feature against the second background when viewed from the second angle, and characterised in that, if the one or more deviations are in the line or lines of deposited material, each of the one or more deviations is lesser in extent than the pitch of the embossed grooves, and for a majority of that region of the substrate; or if the one or more deviations are in the embossed groove or grooves, each of the one or more deviations is lesser in extent than the pitch of lines of deposited material for a majority of that region. providing, in the substrate, a plurality of embossed grooves extending in a substantially parallel manner, there being a pitch for the spacing between the embossed grooves, such that the plurality of lines of deposited material are provided in the vicinity of the embossed grooves; in a background region of the substrate to be presented to a viewer of the substrate, there being a fixed positional relationship between the substantially parallel embossed grooves and the substantially parallel lines of deposited material, such that the region presents a first background to a viewer of the substrate when viewed from a first angle, and such that the region presents a second background to a viewer of the substrate when viewed from a second angle, the first and second angles being defined as angles on either side of a perpendicular to that substrate and in an image region of the substrate to be presented to a viewer of the substrate, there being one or more deviations from the fixed positional relationship to provide a first image feature against the first background when viewed from the first angle, and a second image feature against the second background when viewed from the second angle, and characterised in that, if the one or more deviations are in the line or lines of deposited material, each of the one or more deviations is lesser in extent than the pitch of the embossed grooves, and for a majority of that region of the substrate; or if the one or more deviations are in the embossed groove or grooves, each of the one or more deviations is lesser in extent than the pitch of lines of deposited material for a majority of that region.