Giant Changing spots Card - Trick Revealed

The magician shows a giant card on which there is 1 diamond suit while on the back there are 4. When the card is shown again it has 3 suits on one side and 6 on the other. This is repeated for a couple of times and then the magician explains to the audience the trick of the effect. Despite this, the audience will be amazed to see that at the end the card shows an 8 of diamonds!

Very easy to do and suitable for any kind of audience.
The metal card measures cm 29 x 20,5 and is also visible at a certain distance.