The card is made of three parts, all of which seem to have neither discernible messages or images. Once the centre sheet (can be transparent plastic or, for reduced environmental impact, printable tracing paper) is placed on one side of the card, that inner image resolves to a greeting message. However, when the same centre sheet is placed on the other side – it resolves this image to another, different greeting! Every message combination has a unique set of cryptographic images.
Attached centre image
Unattached centre image
EU Trade mark (without text): 017967247; Type: Motion;Status: Registered
UK Trade mark number: UK00003320935; Status: Registered