Tú ves color cuando las células fotorreceptoras en la retina de tu ojo son estimuladas por la luz. Si dichas células se adaptan a un estímulo prolongado, responden con menos sensibilidad ¡y los colores cambian!
Test the limits of your peripheral vision and measure how much you can see out of the corner of your eye. You’ll find that you can detect motion at a wide angle, colors at a narrow angle, and detailed shapes at a surprisingly narrow angle.
When you look through a narrow slit, you can see only a thin strip of the world around you. But if you move the slit around rapidly, your eye and brain combine these thin strips to make a single complete picture.
A pinhole in a card can act like a magnifying glass, helping your eye focus on an object that is very close to you. However, by limiting the amount of light that reaches your eye from the object, the pinhole also makes the object appear dimmer.
When light reflects from nonmetallic surfaces, it becomes polarized—the reflected light is usually vibrating more in one direction than others. Polarizing sunglasses reduce this reflection when the polarizing lenses are oriented properly.
Even with our eyes closed, we have a sense of our body parts and their position thanks to proprioceptors in our muscles, tendons, joints and inner ear. They (and our brains) provide a sense of body orientation and movement.
La electricidad estática produce chispas cuando te peinas en un día de frío y hace que los globos se peguen a la pared. Aquí, la electricidad estática hace que las “pulgas” eléctricas comiencen a saltar.