The requirements for making a good mirror are a surface with a very high degree of flatness preferably but not necessarily with high reflectivityand a surface roughness smaller than the wavelength of the light. The earliest manufactured mirrors were pieces of polished stone such as obsidiana naturally occurring volcanic glass. Examples of obsidian mirrors found in Anatolia modern-day Turkey have been dated to around B.
Prehistoric times[ edit ] Prehistoric notions about the status of humanity may be guessed by the etymology of ancient words for man. From the earliest times, man made out a claim of dominance of humanity alongside radical pessimism because of the frailty and brevity of human life in the Hebrew Biblefor example, dominion of man is promised in Genesis 1: Socrates advocated for all humans to " know thyself ", and gave the doubtlessly tongue-in-cheek definition of humans as "featherless bipeds" PlatoPoliticus.
The 13th century pope Innocent III wrote about the essential misery of earthly existence in his "On the misery of the human condition" — a view that was disputed by, for example, Giannozzo Manetti in his treatise "On human dignity. Renaissance humanism A famous quote of Shakespeare 's Hamlet II, ii,expressing the contrast of human physical beauty, intellectual faculty, and ephemeral nature: What a piece of work is a man!
How noble in reason! And yet, to me, what is this quintessence of dust?
Cogito ergo sum  French: Modern era[ edit ] The Enlightenment was driven by a renewed conviction, that, in the words of Immanuel Kant"Man is distinguished above all animals by his self-consciousness, by which he is a 'rational animal'. In the early 20th century, Sigmund Freud dealt a serious blow to positivism by postulating that human behaviour is to a large part controlled by the unconscious mind.
Many anthropologists think that readily observable characteristics tool -making and language are based on less easily observable mental processes that might be unique among humans: Nor is it clear at what point exactly in human evolution these traits became prevalent.
They may not be restricted to the species Homo sapiens, as the extinct species of the genus Homo e. Homo neanderthalensisHomo erectus are believed to also have been adept tool makers and may also have had linguistic skills.
Rather than moving on to the next 'task' we can review the process and outcome of the task and — with the benefit of a little distance lapsed time we can reconsider what the value of experience might be for us and for the context of which it was a part.Good News Ministries is the Catholic center for faith growth with daily reflections, virtual retreats, prayer, WordBytes articles and more.
A mirror is an object that reflects light in such a way that, for incident light in some range of wavelengths, the reflected light preserves many or most of the detailed physical characteristics of the original light, called specular lausannecongress2018.com is different from other light-reflecting objects that do not preserve much of the original wave signal other than color and diffuse reflected.
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