Lama Yeshe used the examples that are mainly physical ie the form. He also uses the eye sense or the sense of seeing in his examples. Because our mind hallucinate based on input from the eyes, ears, nose, tongue, tactile sense, the mind is very noisy with the "unreal" information and thinks that it is real. Further, these contact senses will be process into feeling and perceptions of "good", "bad" or neutral and also the mind itself has karmic formations (karma that is unfolding) and a sense of selfish consciousness, it all results in craving and clinging to certain fixed ideas of things. If these ideas does not conform to the ideas of this hallucinated mind then there is suffering. And then we have anger and generate more negative karma. That is how the ordinary mind works. This is the disease of samsara.
That is why we need to Dharma to get us out of samsara.