think of it the same as painting a picture. if your painting has one large swathe of paint you can go over it in one stroke of the paint brush it is done. if your painting has lots of fine details you need to go over it again and again with different strokes to get all the different colored details. in this analogy each paint brush stroke is a piece of memory.
so a picture of a blue sky with a white mountains underneath my only have two main strokes and say eight accent strokes of shadows on the mountains, making relatively small photo memory wise. a photo of a rose bush requires dozens and dozens of strokes to save all the details of the shadows, leaves, flowers, etc. and will have a much bigger memory size.
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