Echo

In audio signal processing and acoustics, an echo (plural echoes) is a reflection of sound, arriving at the listener some time after the direct sound. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source. The time delay is the extra distance divided by the speed of sound. The word echo derives from the Greek ἠχώ (ēchō), itself from ἦχος (ēchos), "sound".Echo in the folk story of Greek is a mountain nymph whose ability to speak was cursed, only able to repeat the last words anyone spoke to her. Animals that use echoes are cetaceans (dolphins and whales) and bats.

Acoustic phenomenon

If so many reflections arrive at a listener that they are unable to distinguish between them, the proper term is reverberation. An echo can be explained as a wave that has been reflected by a discontinuity in the propagation medium, and returns with sufficient magnitude and delay to be perceived. Echoes are reflected off walls or hard surfaces like mountains and privacy fences.

The Picture of Dorian Gray

The Picture of Dorian Gray is a philosophical novel by the writer Oscar Wilde, first published complete in the July 1890 issue of Lippincott's Monthly Magazine. The magazine's editor feared the story was indecent, and without Wilde's knowledge, deleted roughly five hundred words before publication. Despite that censorship, The Picture of Dorian Gray offended the moral sensibilities of British book reviewers, some of whom said that Oscar Wilde merited prosecution for violating the laws guarding the public morality. In response, Wilde aggressively defended his novel and art in correspondence with the British press, although he personally made excisions of some of the most controversial material when revising and lengthening the story for book publication the following year.

The longer and revised version of The Picture of Dorian Gray published in book form in 1891 featured an aphoristic preface—a defence of the artist's rights and of art for art's sake—based in part on his press defences of the novel the previous year. The content, style, and presentation of the preface made it famous in its own right, as a literary and artistic manifesto. In April 1891, the publishing firm of Ward, Lock and Company, who had distributed the shorter, more inflammatory, magazine version in England the previous year, published the revised version of The Picture of Dorian Gray.

Secret Garden

Secret Garden may refer to:

In literature

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Secret (disambiguation)

A secret is information kept hidden.

Secret or The Secret may also refer to:

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Film and television