One of the types of multiple exposure that interests me, is the effect created by UK photographer and teacher John Blakemore, who achieved a 'transparent' look where he was building up images rather in the form of layers. Looking at a still life for example, you would realise that there were other images underneath, not strikingly obvious at first glance. That, I would like to try but am not sure how to go about it. He also made some images in a 'windscape' series, where the foliage on trees took on the appearance of cotton wool and I assume that was by using the technique outlined by Les.