Striped snail (Xerolenta Obvia, Menke 1828)

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Striped snail (Xerolenta Obvia, Menke 1828)...

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Striped snail (Xerolenta Obvia, Menke 1828) sent on August 13, 2018 (8:49) by Carmelo Riela. 8 comments, 671 views.

, 1/3 f/14.0, ISO 100, tripod.

La sezione aurea o numero aureo o proporzione divina, non è altro che un numero, per la precisione 1,618033, scoperto dal matematico Leonardo Fibonacci intorno al 1200. Esprime il rapporto fra due lunghezze disuguali, delle quali la maggiore è medio proporzionale tra la minore e la somma delle due. Ma questo numero aureo è strettamente collegato anche alla sequenza di Fibonacci, la successione infinita di numeri interi positivi, in cui ciascun numero è la somma dei due precedenti e i primi due termini della successione sono per definizione uguali a uno, scoperta sempre dal matematico pisano. Tutte queste definizioni ci servono per scoprire che in natura questo numero aureo o proporzione divina compare molto spesso, dal mondo microscopico fino all'universo. Esempi ne possiamo trovare nel mondo botanico, dove i fiori e le foglie presentano una disposizione geometrica che rispecchia la spirale aurea, come avviene nel girasole, oppure nel mondo animale, dove la conchiglia della specie Nautilus sembra cresciuta seguendo proprio la spirale aurea, fino ad arrivare all'universo: la nostra galassia si sviluppa in estensione come la spirale aurea. È proprio il caso di dire quanto la magia della natura sia spettacolare.

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21 persons like it: 78marcolino78, Alcenero, Bo Larkeed, Bredo 83, Carlo Alfonso, Claudiosquarc, Cristian_zilio, Dantes, Errevi, Franco Buffalmano, Giusrusso, Japandrea, Magda69, Mario_61, Phshoot, Pigi47, Pippos, Quellolà, Roberto Diaferio, Rufus68, Wolfman1908

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78marcolino78

sent on August 26, 2020 (13:28) | This comment has been automatically translated (show/hide original)

beautiful composition, pose with excellent colors and sharpness, nice close-up to photograph, hello from mark

Carmelo Riela

sent on August 26, 2020 (16:02) | This comment has been automatically translated (show/hide original)

Hi good afternoon Marcolino thanks for your comment.great light Carmelo Sorriso

Alcenero

sent on September 05, 2021 (12:48) | This comment has been automatically translated (show/hide original)

Really very nice this composition
Many compliments

Carmelo Riela

sent on September 06, 2021 (15:54) | This comment has been automatically translated (show/hide original)

Thanks mille Alcenero for your comment. Sorriso

Bo Larkeed

sent on March 08, 2022 (21:42) | This comment has been automatically translated (show/hide original)

Great recovery! Congratulations

Carmelo Riela

sent on March 09, 2022 (11:00) | This comment has been automatically translated (show/hide original)

Thank you very much Bo Larkerd for your comment. Good light Carmelo. :-) :-) :-) :-) :-) :-)

Pigi47

sent on March 10, 2024 (9:34) | This comment has been automatically translated (show/hide original)

The spiral of the snail is well represented by good sharpness.

Carmelo Riela

sent on March 10, 2024 (15:37) | This comment has been automatically translated (show/hide original)

Thank you so much Piero for your comment.great light Carmelo Sorriso

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