From a very good friend, Conniechiwa of Writings on the Wall and Postcards from Miss Igorota:

Lenticular postcards are postcards printed using the lenticular technology – that means, it has a 3D illusion of depth, or, in the above postcards case, the ability to change or move as the image is viewed at different angles (Errrm, thanks, Mr. Wiki!). I call this postcard the Here-There postcard. As you can see, there is a faint letter T beside the more visible word HERE,  but if you tilt the postcard – the letter T becomes visible so the word now reads as THERE :) Clever, isn’t it?

At the back of the postcard, Conniechiwa pasted a cartoon strip she cut out from a newspaper. It cracks me up!