Whenever we do look, no matter when, we cannot help but discover that mind has no form, color or shape—none at all. Then we may wonder, "Does that mean that there is no mind? Does the mind not exist?" If there were no consciousness in the body, the body would be a corpse. Yet we can see and hear, and we can understand what we are reading—so we are not dead, that's for sure. The truth is that while mind is empty—it has no shape, color or form—it also has the ability to cognize; it has a knowing quality. The fact is that these two aspects, being empty and able to know, are an indivisible unity.
Mind does exist as a continuing presence of cognizance. We are not suddenly extinct because there are no thoughts; there is something ongoing, a quality of being able to perceive. What exactly is this mind? What does it look like? If mind exists, then in what mode does it exist? Does the mind have a particular form, shape, color and so forth?
We should simply take a close look at what it is that perceives and what it looks like, then try to find out exactly what it is.