Hop's Gallery
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Hollister (Hop) David
P. O. Box 39, Ajo, Arizona 85321
520-387-7688
hopd@cunews.info
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Margarita & Nico
Changoros
Nellie Jo
Tunnel
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Virgin of Guadalupe
Dragons
Artifact
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Annunciation
7 Birds
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Crab
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Suessian Manifold
Elements
Rams
Copper News Mural
Suessian Manifold
Elements
Rams
Copper News Mural
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For prints of my drawings and paintings:
Hop's Prints
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Hop David Coloring Books
Celestial Mechanics Coloring Book
A Hop David coloring book of conic sections
and celestial mechanics

tessellation coloring book
A Hop David coloring book
of Escher like tessellations

Geoscapes
A Hop David coloring book
of various geometrical landscapes.

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.
These coloring books are a good tool for getting kids interested in geometry and math.
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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

Outside Links

e-mail hopspage@tabletoptelephone.com
Hop David
P. O. Box 39, Ajo, Arizona 85321
520-387-7688

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