The images we see on a mirror are reflections, but they lack substance. In the same way, conventional phenomena arise from (and in) the basis-of-all, but they are not ultimately real.
If the mirror is dirty or warped, the reflections will be dull or distorted. Similarly, some of our perceptions can be more valid (clear) than others.
Appearances are false: insubstantial, impermanent, and dependent on multiple causes and conditions. And yet, they arise continuously.