Our senses create our reality. They can trick us, but also teach us.
In the 1970s, psychologist Diana Deutsch discovered an audio illusion that made her feel like her brain was a little bit broken.
“It seemed to me that I’d entered another universe or I’d gone crazy or something … the world had just turned upside down!” Deutsch recalls.
Like the visual illusions that trick our eyes into seeing impossible things, the audio illusion Deutsch discovered in the 1970s fooled her ears.
You can hear Deutsch’s “Octave Illusion” here for yourself. Make sure you’re wearing headphones (it doesn’t work with speakers).