Illusions of Seeing: Exploring the World of Visual Perception

This book explores the mysteries of vision, discussing the essence of light, the basic laws of human perception, geometric-optical illusions, the perception of form, brightness, and translucency, ambiguous perception, color vision, spatial vision, and the perception of motion. It provides readers with experiments to help them discover optical illusions and the features of their own perception.

Format: Paperback / softback
Length: 274 pages
Publication date: 07 July 2022
Publisher: Springer Nature Switzerland AG

Why do we need two eyes?

Humans have two eyes because it provides them with a 360-degree view of their surroundings, allowing them to see objects in all directions. This is essential for tasks such as walking, running, driving, and navigating.

Having two eyes also helps in depth perception. When we look at an object, our two eyes provide slightly different images, which our brain combines to create a single, three-dimensional image. This allows us to judge the distance of objects and perceive their shape and size.

In addition, having two eyes allows us to see in color. The colors we see are a result of the different wavelengths of light that our eyes detect. By having two eyes, we can see a wider range of colors than if we had only one eye.

Overall, having two eyes is essential for our visual perception and is one of the reasons why humans are so well-adapted to their environment.

Why are all cats grey at night and appear to move faster the day?

Cats are not always grey at night and do not appear to move faster the day. In fact, cats are known for their ability to see in the dark and are often active at night.

At night, cats have a better ability to see than humans because they have a larger number of rod cells in their retinas. Rod cells are responsible for detecting light in low-light conditions, and they allow cats to see in the dark. In contrast, humans have a smaller number of rod cells and rely more on their cone cells to see in the dark.

Cats also have a better ability to see in the dark because they have a reflective layer of tissue called the tapetum lucidum. This layer reflects light back through the retina, increasing the amount of light that reaches the rod cells and allowing cats to see in even the darkest conditions.

However, it is important to note that cats are not always grey at night. Some cats may have different coat colors, such as black, white, or brown, depending on their breed and genetics. Additionally, cats may be more active during the day because they are more likely to hunt for food or play during this time.

Why is the sky blue and the setting sun red?

The sky is blue during the day because the air molecules in the atmosphere scatter blue light more than they scatter other colors of light. This is known as the Rayleigh scattering effect. The blue light is scattered by the smaller air molecules in the atmosphere, which are closer together than the larger air molecules. This scattering causes the blue light to spread out and become visible to our eyes.

The setting sun is red because the air molecules in the atmosphere scatter red light more than they scatter other colors of light. This is known as the Rayleigh scattering effect. The red light is scattered by the smaller air molecules in the atmosphere, which are closer together than the larger air molecules. This scattering causes the red light to spread out and become visible to our eyes.

In addition to the Rayleigh scattering effect, the setting sun is also red because the sun's light is also filtered by the atmosphere. The sun's light contains a lot of different colors, but the red colors are the most visible because they have the longest wavelengths. As the sun sets, the light passes through a thicker layer of the atmosphere, which filters out the shorter wavelengths of light, leaving only the red colors visible.

Overall, the sky is blue during the day because the air molecules in the atmosphere scatter blue light, and the setting sun is red because the air molecules in the atmosphere scatter red light. These effects are caused by the properties of light and the atmosphere, and they are a beautiful and natural part of the world around us.

Weight: 450g
Dimension: 235 x 155 (mm)
ISBN-13: 9783030636371
Edition number: 1st ed. 2021