A. They arise because you don’t know what they are. In fact, you don’t know what an illusion is even though you often mention it. You can’t remove or stop it from showing up because you don’t know what it is.
In fact, there are no illusions at all. There is only the truth, or the true-self. The problem is that you are mistaking the truth for illusions. Enlightenment is to realise that all illusions are the truth, or the true-self. As the Diamond Sutra says, to realise that a flower is not a flower, but emptiness, is enlightenment. To realise that an illusion is not real, but empty, is enlightenment. Realising that an illusion is not an illusion, but the truth, or the true-self is enlightenment.
All writing ©Boo Ahm. All images ©Simon Hathaway