Are the yellow curtains the truth?

That which has formed is not real, only the formless is permanent. Once this is known, you will not return to illusion. So that which has formed is not real, real from which perspective. Is it from the reality of the truth? Because we have seen that in the very real, everything is changing. So can we say that it is the truth? So if I were to say the curtain is yellow, then tomorrow they could become red, they could fade in the sun. So is the curtain the yellow the truth? No, because it is possible for them to change. So in the same way, everything at the level of form, these bodies, this room, this ashram, the city, everything is subject to change, constantly changing.