5.10.1. In Action
The experiment described here was done in the lab of Elizabeth Spelke.4 You could potentially do it in your own home, but be prepared to build some large props and to get dizzy.
Imagine a room like the one in Figure 5-4. The room is made up of four curtains, used to create four walls in a rectangle, defined by two types of information: geometric (two short walls and two long walls) and color information (one red wall).
Now, think about the corners. If you are using only geometric information, pairs of corners are identical. There are two corners with a short wall on the left and a long wall on the right and two corners the other way around. If you are using only color information, there are also two pairs of identical corners: corners next to a red wall and corners not next to a red wall.
Using just one kind of information, geometry or color, lets you identify corners with only 50% accuracy. But using both kinds of information in combination lets you identify any of the four corners with 100% accuracy, because although both kinds of information are ambiguous, they are not ambiguous in the same way.
Taken from : Mind Hacks
