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Hollister (Hop) David
P. O. Box 39, Ajo, Arizona 85321
520-387-7688
hopd@cunews.info
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I've been published!
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A Hop David coloring book of Escher like tessellations.
Released in September 2008.
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A Hop David coloring book of various geometrical landscapes.
To be released in February of 2009.
A lot of pages are devoted to space filling polyhedra with an emphasis on octahedra alternating with tetrahedra.
There's also some polyhedra studies, logarithmic spirals, fractals (only the first few iterations or they'd be impossible to color!) and some miscellaneous.
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And some of my illustrations are in a book by Burkard Polster Eye Twisters which has been out since spring of 2008.
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Dandelin Spheres
A study of conic sections
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Specific Angular Momentum as a Bivector
A little Clifford Algebra
Asteroid Towns
Colonizing the asteroids
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Spiral Tessellations
Spiral Tessellations and a Helicoid
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Kepler Fractals
Some Koch like fractals based on Kepler's polyhedra
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Perspective Study
Including some of M. C. Escher's observations
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Curl Ups
An essay on Escher's invented animal
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Frank Zubek's Construction Blocks
Frank's Elusive Cube
Moiré Patterns
Ellipses & hyperbolas
Parabolas
Eccentricity of Conics
Circles?
Drawings of Numbers
Coefficients of (a+b)^n
ln(2)
pi/4
2/3
(pi^2)/12
Escher
Sphere Spirals
Drawings of Equations
cos(a+b)=cos(a)cos(b) - sin(a)sin(b)
& sin(a+b)=cos(a)sin(b) + cos(b)sin(a)
sin(h)/h approaches 1 as h approaches 0
(a+b)^2
= a^2 + 2ab + b^2 & (b-a)^2
= a^2 - 2ab + b^2
Angles of a
triangle total 180 degrees
Pythagorean Theorem
Areas of plane geometry figures (circle, triangle, parallelogram, rectangle)
Paper Blackhole Models
http://clowder.net/hop/etc./wormhol2.html
Quadpods
Tetrahedral Spaceships
An interesting curve
& now I know it's name
Tiles
The
Table Top Tessellations
17 Wallpaper Groups
Twistohedra
A family of polyhedra
starting with the icosohedron
Making Polyhedra with Soda Straws
Mike Patten's inexpensive and easy method of making polyhedral models
Jacob Goff
Paintings by Jacob Goff
Jacob's My Space Page
Me
A pic of my daughters & I
(taken by William Chow)
My family and the Chow family
e-mail hopspage@tabletoptelephone.com
Hop David
P. O. Box 39, Ajo, Arizona 85321
520-387-7688
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