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# Sphere

A sphere (from Greek σφαίρα - sphaira, "globe, ball,") is a symmetrical geometrical object. In non-mathematical usage, the term is used to refer either to a round ball or to its two-dimensional surface. In mathematics, a sphere is the set of all points in three-dimensional space (R3) which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. Thus, in three dimensions, a mathematical sphere is considered to be a two-dimensional spherical surface embedded in three-dimensional space, rather than the volume contained within it (which mathematicians would instead describe as a ball). The fixed point is called the center, and is not part of the sphere itself. The special case of r = 1 is called a unit sphere.

This article deals with the mathematical concept of a sphere. In physics, a sphere is an object (usually idealized for the sake of simplicity) capable of colliding or stacking with other objects which occupy space.

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Acoustic

On Tour

Sir Mania

Acoustic

On Tour

Sir Mania

Acoustic

On Tour

Sir Mania

Acoustic

Four in One

Sir Mania

Four in One

Sir Mania

Closer

Four in One

Closer

Four in One

Sir Mania

Closer

Four in One

Four in One

Sir Mania

Closer

Flight Path

Sir Mania

Closer

Sphere

Closer

Flight Path

Sphere

Closer

Flight Path

Sphere

Flight Path

Flight Path

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Sphere

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Bird Songs

Sphere

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Closer

Bird Songs

Sphere

Four for All

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Sphere

Four for All

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Breathe

Bird Songs

Four for All

Breathe

Sphere

Four for All

Bird Songs

Sphere

Four for All

Sphere

Four for All

Breathe

Pumpkin's Delight

Pumpkin's Delight

Breathe

Pumpkin's Delight

Breathe