In coordination chemistry, the coordination sphere refers to a central atom or ion and an array of molecules or anions, the ligands, around. Molecules that are attached noncovalently to the ligands are called the second coordination sphere.
Read more about Coordination Sphere: First Coordination Sphere, Second Coordination Sphere
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“I count him a great man who inhabits a higher sphere of thought, into which other men rise with labor and difficulty; he has but to open his eyes to see things in a true light, and in large relations; whilst they must make painful corrections, and keep a vigilant eye on many sources of error.”
—Ralph Waldo Emerson (1803–1882)