Perhaps you have heard of this sytem of maintaining an overall balance in your body, and hence correspondingly with your emotions and mind.
I will spare you the details of this theory. It is based on the Yin or Yang factor in various foods, as well as external forces which may affect you.
There is a very simple sytem of determining whether you are too yang, too yin or perfectly balanced.
If your poos are soft, you are too yin. If they are hard and dry, then you are too yang. If you are in perfect balance, your poos float.
While I have never considered photographing my poos, I pay careful attention to their composition. If too yin or too yang, an adjustment may be required in my diet or other habits.
Zen macrobiotics is a marvellously simple theory, which can readily be verified by observing popular food combinations.
I know this doesn't directly address the topic, but I am saying that there is considerable merit in observing one's "stools" (as the yogis delicately describe faeces)
[When I was associating with some New Age people, the production of a "floater" was advertised with great pride and satisfaction.]