ISU CCEE BioE 202: Aesthetics The Golden Section – its origin and usefulness in engineering.
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Transcript of ISU CCEE BioE 202: Aesthetics The Golden Section – its origin and usefulness in engineering.
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ISU CCEE
BioE 202: AestheticsBioE 202: AestheticsBioE 202: AestheticsBioE 202: Aesthetics
The Golden Section – its origin and usefulness in engineering
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ISU CCEE
The Fibonacci SeriesThe Fibonacci SeriesThe Fibonacci SeriesThe Fibonacci Series
Fibonacci Series0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55,
… (add the last two to get the next
) What is the next number?Ratio between numbers Leonardo Fibonacci
c1175-1250.
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ISU CCEE
Fibonacci and plant Fibonacci and plant growthgrowthFibonacci and plant Fibonacci and plant growthgrowth
Plant branches couldbe modeled to grow such that they can branchinto two every month once they are two months old.This leads to a Fibonacciseries for branch counts
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ISU CCEE
Fibonacci’s rabbitsFibonacci’s rabbitsFibonacci’s rabbitsFibonacci’s rabbits
Rabbits could be modeled to conceive at 1 month of ageand have two offspring every month thereafter.This leads to a Fibonacciseries for rabbit counts for each subsequent month
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ISU CCEE
Petals on flowersPetals on flowersPetals on flowersPetals on flowers
3 petals (or sepals) : lily, iris
Lilies often have 6 petals formed from two sets of 3
4 petals Very few plants show 4 e.g. fuchsia
5 petals: buttercup, wild rose, larkspur, columbine (aquilegia), orchid
8 petals: delphiniums
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ISU CCEE
Petals on flowersPetals on flowersPetals on flowersPetals on flowers
13 petals: ragwort, corn marigold, cineraria, some daisies
21 petals: aster, black-eyed susan, chicory 34 petals: plantain, pyrethrum
55, 89 petals: michaelmas daisies, Asteraceae family
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ISU CCEE
Divide each number by the number before it, we will find the following series of numbers:
1/1 = 1, 2/1 = 2, 3/2 = 1·5, 5/3 = 1·666..., 8/5 = 1·6, 13/8 = 1·625, 21/13 = 1·61538...
Ratio of Fibonacci numbers
These values convergeto a constant value,1.61803 39887……,the golden section, Dividing a number by the number behind it: 0·61803 39887..... 1/
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ISU CCEE
The golden section in The golden section in geometrygeometryThe golden section in The golden section in geometrygeometry
The occurrence of the ratio, The meaning of the ratio The use of in engineering
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ISU CCEE
Constructing the golden Constructing the golden sectionsectionConstructing the golden Constructing the golden sectionsection
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ISU CCEE
Geometric ratios Geometric ratios
involving involving : : PentagonPentagonGeometric ratios Geometric ratios
involving involving : : PentagonPentagon
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ISU CCEE
Geometric ratios Geometric ratios
involving involving : : DecagonDecagonGeometric ratios Geometric ratios
involving involving : : DecagonDecagon
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ISU CCEE
Golden Spiral Golden Spiral ConstructionConstructionGolden Spiral Golden Spiral ConstructionConstruction
Start with a golden rectangleConstruct a square insideConstruct squares in the remaining rectangles in a rotational sequence
Construct a spiral through the corners of the squares
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ISU CCEE
Golden Spiral ShortcutGolden Spiral ShortcutGolden Spiral ShortcutGolden Spiral Shortcut
http://powerretouche.com/Divine_proportion_tutorial.htm
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ISU CCEE
Golden Triangle and Golden Triangle and SpiralsSpiralsGolden Triangle and Golden Triangle and SpiralsSpirals
1
1
1
1/
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ISU CCEE
Golden proportions in Golden proportions in humanshumansGolden proportions in Golden proportions in humanshumans
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ISU CCEE
Echinacea – the Midwest Echinacea – the Midwest ConeflowerConeflowerEchinacea – the Midwest Echinacea – the Midwest ConeflowerConeflower
Note the spirals originatingfrom the center. These can be seen moving out bothclockwise and anti-clockwise.These spirals are no mirrorimages and have differentcurvatures. These can be shown to be square spiralsbased on series of golden rectangle constructions.
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ISU CCEE
Cauliflower and Romanesque Cauliflower and Romanesque (or Romanesco) (or Romanesco) BrocolliXCauliflowerBrocolliXCauliflower
Cauliflower and Romanesque Cauliflower and Romanesque (or Romanesco) (or Romanesco) BrocolliXCauliflowerBrocolliXCauliflowerNote the spiral formation in the florets as well as in the total layout
The spirals are, once again, golden section based
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ISU CCEE
Pine cone spiral Pine cone spiral arrangementsarrangementsPine cone spiral Pine cone spiral arrangementsarrangements
The arrangement here can once more be shown to be spirals based on golden section ratios.
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ISU CCEE
Pine cone spiralsPine cone spiralsPine cone spiralsPine cone spirals
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ISU CCEE
Fibonacci Rectangles Fibonacci Rectangles and and Shell SpiralsShell Spirals
Fibonacci Rectangles Fibonacci Rectangles and and Shell SpiralsShell Spirals
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ISU CCEE
Construction: Brick Construction: Brick patternspatternsConstruction: Brick Construction: Brick patternspatterns
The number of patternspossible in brickwork Increases in a Fibonacciseries as the width increases
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ISU CCEE
Phi in Ancient Phi in Ancient ArchitectureArchitecturePhi in Ancient Phi in Ancient ArchitectureArchitecture
A number of lengthscan be shown to berelated in ratio to eachother by Phi
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ISU CCEE
Golden Ratio in Golden Ratio in ArchitectureArchitectureGolden Ratio in Golden Ratio in ArchitectureArchitecture
The Dome of St. Paul, London. Windsor Castle
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ISU CCEE
Golden Ratio in Golden Ratio in ArchitectureArchitectureGolden Ratio in Golden Ratio in ArchitectureArchitecture
Baghdad City Gate The Great Wall of China
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ISU CCEE
Modern Architecture: Eden Modern Architecture: Eden projectprojectModern Architecture: Eden Modern Architecture: Eden projectproject
The Eden Project's new Education
Building
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ISU CCEE
Modern Architecture: California Polytechnic Engineering Plaza Modern Architecture: California Polytechnic Engineering Plaza
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ISU CCEE
More examples of golden More examples of golden sectionssectionsMore examples of golden More examples of golden sectionssections
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ISU CCEE
Mathematical Relationships Mathematical Relationships for Phifor PhiMathematical Relationships Mathematical Relationships for Phifor Phi
The Number Phive
50.5 x .5 + .5 = 1.61803399 = phi phive to the power of point phive
times point phive plus point phive = phi
1.61803399 2 = 2.61803399 = phi +1
1 / 1.61803399 (the reciprocal) = 0.61803399 = phi - 1
.618033992 + .61803399 = 1
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ISU CCEE
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ISU CCEE
Golden Ratio in the ArtsGolden Ratio in the Arts Aztec Ornament
Golden Ratio in the ArtsGolden Ratio in the Arts Aztec Ornament
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ISU CCEE
Golden Ratio in the ArtsGolden Ratio in the ArtsGolden Ratio in the ArtsGolden Ratio in the Arts
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ISU CCEE
Golden Ratio in the ArtsGolden Ratio in the ArtsGolden Ratio in the ArtsGolden Ratio in the Arts
Piet Mondrian’s Rectangles
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ISU CCEE
Design Applications of PhiDesign Applications of PhiDesign Applications of PhiDesign Applications of Phi
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ISU CCEE
Design Applications of PhiDesign Applications of PhiDesign Applications of PhiDesign Applications of Phi
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ISU CCEE
Phi in DesignPhi in DesignPhi in DesignPhi in Design
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ISU CCEE
Phi in AdvertisingPhi in AdvertisingPhi in AdvertisingPhi in Advertising
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ISU CCEE
Three-dimensional Three-dimensional symmetry:symmetry:the Platonic solidsthe Platonic solids
Three-dimensional Three-dimensional symmetry:symmetry:the Platonic solidsthe Platonic solids
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ISU CCEE
Octahedron Octahedron 8-sided solid8-sided solidOctahedron Octahedron 8-sided solid8-sided solid
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ISU CCEE
DodecahedronDodecahedronDodecahedronDodecahedron
This 12-sided regular solid is the 4th Platonian figure
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ISU CCEE
Note the three mutuallyorthogonal goldenrectangles that could be constructed
Icosahedron Icosahedron 20-sided solid20-sided solidIcosahedron Icosahedron 20-sided solid20-sided solid
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ISU CCEE
Three-dimensional near-Three-dimensional near-symmetrysymmetryThree-dimensional near-Three-dimensional near-symmetrysymmetry
http://www.mathconsult.ch/showroom/unipoly/list-graph.html