Improvements in and relating to tamper-evident devices

A method of manufacturing a tamper-evident security device, the method comprising:

• providing an optically transparent layer including an array of separate optical focusing elements;
• providing an array of separate image elements collectively defining an image viewable through the optically transparent layer, wherein each of the optical focusing elements is positioned to reveal therethrough a view of one or more of said image element(s);
• providing an optically transparent adhesive layer between the optically transparent layer and the array of separate image elements which retains the optical focusing elements so positioned with respect to the image elements thereby in cooperation to reveal the image;
• wherein the adhesive strength of the adhesive layer renders the optically transparent layer mechanically separable from the array of separate image elements by release of the adhesive layer to cease the cooperation.