UNDER THE DOME WHAT IS 5.D. ?

1.  See 
2. Feel
3. Hear
4. 3 Dimensions
5. Flat  

- See -

The lens is a clear disc-like structure that helps to focus light on the retina.
It can do this because it is adjustable, and uses a muscle called the ciliary muscle to change shape and help us focus on objects at different distances. The automatic focusing of the lens is a reflex response and is not controlled by the brain.

Once the image is clearly focused on the sensitive part of the retina, energy in the light that makes up that image creates an electrical signal. Nerve impulses can then carry information about that image to the brain through the optic nerve.

Other parts of the eye include the aqueous humor, a liquid which sits in a chamber behind the cornea, and the vitreous humor, the clear gel that fills the space between the lens and the retina. The scleroses is the white part of the eye, forming an outer layer that protects everything inside, while the choroid is the layer of the eye that lies between the retina and the scleroses. It is made up of layers of blood vessels that nourish the back of the eye.

- Feel -

When the verb feel is used in the sense "to think or believe," it typically implies believing or having an opinion on the basis of emotion or intuition, even in circumstances unsupported by much real evidence. Although some usage experts object, such use is well established in English and can be traced as far back as Middle English. When feel is used specifically to express a subjective impression, it is often used with as if, as though, or that and followed by a full sentence: I felt as if my world had come to an end. He feels as though it is always raining. I feel that things will get better now. More informally, feel can be used without as if/as though/that : I feel he's guilty. And a full sentence does not have to follow: I felt his answer to be impolite. In the same sense of "to think or believe," an alternative phrase feel like is found in informal or casual speech.This use of feel like typically expresses an opinion or emotional sentiment with a softened or tentative tone: I feel like nothing is getting done here. 

I feel like he is just too arrogant. 

Though increasingly common, use of the phrase feel like has been criticized as lazy thinking that ignores real evidence, while avoiding confrontation and debate.

- Hear -

Hearing depends on a series of complex steps that change sound waves in the air into electrical signals. Our auditory nerve then carries these signals to the brain.

• Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum.
• The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are called the malleus, incus, and stapes.
• The bones in the middle ear amplify, or increase, the sound vibrations and send them to the cochlea, a snail-shaped structure filled with fluid, in the inner ear. An elastic partition runs from the beginning to the end of the cochlea, splitting it into an upper and lower part. This partition is called the basilar membrane because it serves as the base, or ground floor, on which key hearing structures sit.
• Once the vibrations cause the fluid inside the cochlea to ripple, a traveling wave forms along the basilar membrane. Hair cells—sensory cells sitting on top of the basilar membrane—ride the wave. Hair cells near the wide end of the snail-shaped cochlea detect higher-pitched sounds, such as an infant crying. Those closer to the center detect lower-pitched sounds, such as a large dog barking.
• As the hair cells move up and down, microscopic hair-like projections (known as stereo-cilia) that perch on top of the hair cells bump against an overlying structure and bend. Bending causes pore-like channels, which are at the tips of the stereo-cilia, to open up. When that happens, chemicals rush into the cells, creating an electrical signal.
• The auditory nerve carries this electrical signal to the brain, which turns it into a sound that we recognize and understand. 

- 3 Dimensions -

Having three dimensions (such as height, width and depth), like any object in the real world.

Example: your body is three-dimensional.

Also known as "3D"

- Flat -

Through A Flat-Earther's Eyes

First, a brief tour of the worldview of a Flat-Earther:
While writing off buckets of concrete evidence that Earth is spherical, they readily accept a laundry list of propositions that some would call ludicrous.
The leading flat-earther theory holds that Earth is a disc with the Arctic Circle in the center and Antarctica, a 150-foot-tall wall of ice, around the rim. NASA employees, they say, guard this ice wall to prevent people from climbing over and falling off the disc. (In keeping with their skepticism of NASA, known Flat-Earther conspiracy theorist Nathan Thompson recently approached a man he said was a NASA employee in a Starbucks in Mid-Day 2017
 In a YouTube video of the exchange, Thompson, founder of the Official Flat Earth and Globe Discussion page, shouted that he had proof the Earth is flat — apparently saying an astronaut drowning was that proof — and that NASA is "lying.")

Earth's day and night cycle is explained by positing that the sun and moon are spheres measuring 32 miles (51 kilometers) that move in circles 3,000 miles (4,828 km) above the plane of the Earth. (Stars, they say, move in a plane 3,100 miles up.) Like spotlights, these celestial spheres illuminate different portions of the planet in a 24-hour cycle. Flat-earthers believe there must also be an invisible "antimoon" that obscures the moon during lunar eclipses.

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