As someone spoke of earlier, Marketing companies have spent millions to research the best ways to make you remember something, and surprise surprise,
the best method to date is hidden symbols in an advertisement.
One example is for a pack of cigarettes in the 50s, I forget the brand, but it was a picture of a cowgirl on a swing. They determined that the average
person flips through a magazine quick enough to not truly notice all the aspects of an image, but the mind itself will recognize anamolies or
abnormalities in the picture. This mental image will then come back up when you are at the store or see another picture of the product - "I've heard
of this before..." Anyway, the ad was a cowgirl on a swing -
With a third leg sticking out of her dress. Needless to say, those brand of
cigarettes sold very well