On page 28 there are two sets of three pictures displaying different parts of a tree. Assuming that the top row of pictures was taken independently, and that the bottom row of pictures tried to replicate the original set, we can infer different facts. The first inference is that the person who took the original set of pictures wrote as well a description of how they were obtained, and the second person followed this set of instructions to produce his photographs. We can infer this because both sets of pictures look very similar, and if someone had the task to photograph a tree they could have gone to any tree, but in this case all the pictures show the same tree and the same areas of it.
We can infer as well that the two sets of pictures were taken with different cameras or filters, since the bottom row has different lightning than the top row, which could be due to a failure to explicitly explain to use the normal set up of the camera or a specific model of photographic device. It can be inferred as well that the sets of pictures were probably taken at different times of the day, although with no major differences in timing, because the position of the light falling over the sap in the middle picture changes slighlty between rows.
Looking at picture b in the top and bottom row, we can notice that the top row is clearly focused on the trunk of the tree and there is no background, while in the bottom row there is a little bit of background on the left and more space of the tree can be appreciated. From these observations we can infer that the second person took this picture further away from the tree than the first person, or that the first person zoomed in closer to the tree trunk than the second person.
Regarding the format of the figures, the top row of pictures has white letters in black boxes placed on the upper left corner of each image. While the bottom row of pictures has also black boxes with letters on the upper left corner of each image, the size of the letters is much smalller, and the placement of the boxes shifts slightly out of frame for the left and right pictures. As well, the spacing between pictures differs between the top and bottom rows, the top one having bigger pictures with less space in-between. From these observations we can infer that in the description of the methods of the first person there were no specifications regarding letter size or spacing, but there were mentions to using specific letters for labelling each picture, as well as using black boxes on the top left corners and white color for the letters.
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