Advertising message can invite a reader to participate in message creation thus leading to greater assimilation and impact.
If the aim is to show the effects of the sunlight on the skin, just consider an image of a sea beach that features a picture post-card size bikini-clad girl. There are two gaps near the knees in this picture.. Ask the reader to put his/her two fingers into the gaps. Let him/her see the contrast.The superimposed fingers are knotty and wrinkled.That gives an idea of the deleterious effects of the sun-rays on the body. The effects will be visible say 10 years hence.Here the reader participates in message creation.