A thirteen-year-old girl once told the teacher James Baraz that she had invented something in her mind that could eliminate war. She called it the Perspective Helmet — a device that would allow the wearer to experience the world directly from another person’s point of view. Not to read about it, or imagine it abstractly, but to genuinely inhabit it.

It’s a remarkable idea. And it points at something the contemplative traditions have been saying for a long time.

You may remember the internet debate over The Dress — that photograph that ignited furious disagreement about whether it was blue and black or white and gold. The colors seem so different that the correct answer should have been obvious. And yet, due to genuine differences in individual visual processing, both camps saw what they saw with complete conviction. Each perception felt entirely real, entirely correct, entirely self-evident. (For the record: it was blue and black. I saw gold and white.)

We are like this with nearly everything. The paradigms through which we perceive the world — our assumptions about how things are, what people mean, what we deserve, what is threatening — were installed by our parents, our cultures, our religions, our accumulated experiences. We did not choose most of them consciously. And yet we come to identify with them so completely that when someone challenges one of these views, it can feel like a personal attack. We feel it viscerally, as though something real were under threat.

But these views are not us. They are thoughts — fleeting, non-physical, largely arbitrary constructs that we have mistaken for a self. At the ground of consciousness, they have no more inherent substance than The Dress had an inherent color. It depended entirely on the apparatus doing the looking.

This is not a merely philosophical point. Whenever our equanimity is disturbed — whenever we find ourselves reactive, contracted, certain that we are right and the other is wrong — it is worth pausing to ask: is this a fact, or is this a thought I have identified with so completely that it feels like one?

We cannot fully control which thoughts arise. But we can choose which ones we continue to cultivate, and which we allow to dissolve. That choice, made again and again with increasing consciousness, is not a small thing. It is the slow, incremental work of waking up.