This may not be exactly what you want, but is the only way I can see to accomplish your goal and will actually add a dramatic effect to your slide. You already have your pics shrinking and moving so the positioning part is taken care of. Now, you need to add animations to each one. Have the picture you want first to fade in, then shrink, then move. Have the next pic fade in and the first pic fade out "with previous". Do the same with each one. So you have, in order, pic 1 appear "after previous", then shrink "after previous" then move "after previous" then pic 2 appear "with previous" and pic 1 fade out "with previous" then pic 2 shrink "after previous", etc., etc. You won't fade out picture 4. As picture 4 is moving have the other 3 pics fade in "with previous" and you will have all 4 pics on your slide where you want them. Play with the timing of each pic to get the effects of coming and going the way you like. Please let me know if and how this works for you. If my directions are as clear as mud, let me know and I will try to clarify for you.