A few years ago, I climbed over a gate and found myself gazing down at a valley. After I’d been walking for a few minutes, looking at the fields and the sky, there was a shift in my perception.

People with aphantasia have no mental imagery—and they’re offering brain scientists a window into consciousness ...

A few years ago I climbed over a gate and found myself gazing down at a valley. After I’d been walking for a few minutes, looking at the fields and the sky, there was a shift in my perception.

Let’s swing for the fences with this one, shall we? Some questions are timeless because they’re so fundamental that everyone ponders them at some point in life (often—for me at least—in the shower).