Is Seeing Believing?

Horizon explores the strange and wonderful world of illusions - and reveals the tricks they play on our senses and why they fool us. We show how easy it is to trick your sense of taste by changing the colours of food and drink, explain how what you see can change what you hear, and see just how unreliable our sense of colour can be. But all this trickery has a serious purpose. It's helping scientists to create a new understanding of how our senses work - not as individual senses, but connected together.

Other episodes for this season

Back from the Dead
Episode 1 - Back from the Dead
The Death of the Oceans?
Episode 2 - The Death of the Oceans?
What Happened Before the Big Bang?
Episode 3 - What Happened Before the...
Is Seeing Believing?
Episode 4 - Is Seeing Believing?
Miracle Cure? A Decade of the Human Genome
Episode 5 - Miracle Cure? A Decade of...
Asteroids - The Good, the Bad and the Ugly
Episode 6 - Asteroids - The Good, the...
Deepwater Disaster - The Untold Story
Episode 7 - Deepwater Disaster - The...
What Is One Degree?
Episode 8 - What Is One Degree?
What Is Reality?
Episode 9 - What Is Reality?
Science Under Attack
Episode 10 - Science Under Attack
The Secret World of Pain
Episode 11 - The Secret World of Pain
Surviving a Car Crash
Episode 12 - Surviving a Car Crash
How to Mend a Broken Heart
Episode 13 - How to Mend a Broken Hear...
Are We Still Evolving?
Episode 14 - Are We Still Evolving?
Predators in Your Backyard
Episode 15 - Predators in Your Backyar...