Lenticular device

A lenticular device comprising:

• a first array of lenticular elements on a first surface of the device;
• and
• a second array of lenticular elements on a second surface of the device,
• wherein the first and second arrays are arranged such that, when the second array is viewed through the first array, a Moiré pattern showing an enlarged image representing an element of the second array is visible,
• characterised in that at least one of the elements includes an embossment providing the at least one of the elements with a cross-section, parallel to the surface on which the at least one of the elements is formed, which has a predetermined and verifiable shape, said shape being irregular in comparison with that of a parallel cross-section through a part of the at least one element not including said embossment.

A lenticular device comprising:

• a first array of elements on a first surface of the device, the elements thereof being lenticular;
• and
• a second array of elements on a second surface of the device,
• wherein the first and second arrays are arranged such that, when the second array is viewed through the first array, a Moiré pattern showing an enlarged image representing elements of the second array is visible,
• characterised in that at least one predetermined and verifiable defect is encoded into at least one of the first and second arrays, which defect is substantially indiscernible to an unaided observer.

A lenticular device comprising:

• a first array of lenticular elements on a first surface of the device;
• and
• a second array of elements on a second surface of the device, said second array of elements consisting of substantially homogeneous elements,
• wherein the first and second arrays are arranged such that, when the second array is viewed through the first array, a Moiré pattern showing an enlarged image representing an element of the second array is visible,
• characterised in that said second array includes at least one predetermined and verifiable discontinuous variation, the variation being in a characteristic of at least one of the elements of the array with respect to the same characteristic of an adjacent element of the array.