How does one explain consistency within phenomena if the mind generates phenomena?

I'm having trouble framing this question right so please let me know if it needs clarification. I'll first describe the issues surrounding the question and then ask the question itself. I've been reading "A Buddhist Bible" compiled by Dwight Goddard. In one of the sutras the Buddha says that all perceived reality is like a dream. Essentially that all we touch, see, taste, hear, and feel is no more real than a dream. It's hard for me to see this because dreams don't seem to follow consistent rules as does the reality we seem to perceive. It seems that in our reality there really do exist laws of physics and mathematical truths and consistency amongst these things. From my understanding, the Buddha said that all phenomena is generated by the mind, but then why is there so much consistency within the laws of physics if it is the case that the mind generates it? I can easily imagine so many inconsistent things, not only that but I can dream them as well, so what distinction exists between activities of the mind such as those that "generate reality" and those that "generate dreams" such that one produces consistent laws of mathematical truths and the other does not? Before I labor on and generate a confusing sequence of unrelated questions let me please clarify the question I wish to be answered: If it is the case that the reality that we perceive is no more real than the dreams that we have, what is the Buddhist explanation for what accounts for the consistency in the laws of physics and mathematical truths which we do observe? Secondly, since so many minds are generating this reality, how is it possible that everyone agrees upon laws of physics and mathematical truths? Doesn't consistency among observers imply an external reality independent of the mind? If consistency does exist then is there really only one mind? Or are there many? If there are many then how can consistency be satisfied?