The phenomena is steamed crap. There are something in the cans, we cannot tell if we never opened because we have no experience in the open can (pure form of sensation). When we open the crap we have first experience can explain the crap taste, smell and color (pure form of understanding). We have the experience for the first time in the opening we can explain the crap in cans without opening a second time. No one knows the true noumena. The crap is caused by egg or otherwise but we don't know where it came from.