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The Tessellation Art of Robert Fathauer. A tessellation is a collection of shapes called tiles that fit together without gaps or overlaps to cover the mathematical plane.

The Tessellation Art of Robert Fathauer

The Dutch graphic artist M.C. Escher became famous for his tessellations in which the individual tiles are recognizable motif such as birds and fish. In Escher's tessellations, the tiles only fit together one way. Following the lead of Roger Penrose, who designed tessellating chickens based on his non-periodic Penrose tiles, Robert Fathauer has designed several sets of tiles that fit together in many different combinations. This features prominently in "Order and Chaos", in which both ordered and disordered regions are realized using the same two types of tiles. Drawing Light and Shadows. Light and shadows visually define objects.

Drawing Light and Shadows

Before you can draw the light and shadows you see, you need to train your eyes to see like an artist. Values are the different shades of gray between white and black. Artists use values to translate the light and shadows they see into shading, thus creating the illusion of a third dimension. Hatching and crosshatching are simple and fun techniques for drawing shading. A full range of values is the basic ingredient for shading. With shading, the magical illusion of three-dimensional reality appears on your drawing paper. Figure 1: Turning a simple line drawing into planet Earth. You know the objects around you are three-dimensional because you can walk up to them, see them from all sides, and touch them. Taking a closer look at light and shadow Before you can draw the appropriate values that illustrate light and shadows correctly, you need to be able to visually identify the following:

Elements of Art: Light Tutorial. Actual light There are a number of ways that light affects or interacts with artwork, from how a piece is lit, to deliberately incorporating the interaction of light within the work.

Elements of Art: Light Tutorial

Lighting of artwork. Tessellation. Image: "The Denial of St. Peter" by Carvagio. Untitled Document. Your Heart & Circulatory System. Listen Did you give your friends valentines and little heart-shaped candies on Valentine's Day?

Your Heart & Circulatory System

Do you ever cross your heart when making a promise that you really, really mean? Or turn on the radio to hear a guy singing about his broken heart? We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Working That Muscle. All About Water - Read, Learn, and Know about Water. Information and Facts about Water. Sometimes interesting - Sometimes disturbing Read on to learn more about the water in your life.

Information and Facts about Water

Everything you ever wanted to know about water. Did you know? Less than 1% of the water supply on earth can be used as drinking water. By the time a person feels thirsty, his or her body has lost over 1 percent of its total water amount. About 25,700 litres (6,800 gallons) of water is required to grow a day's food for a family of four. A child dies every 8 seconds from water-related disease. Groundwater can take a human lifetime just to traverse a mile. A person can live about a month without food, but only about a week without water. Most of the earth's surface water is permanently frozen or salty. If all the world's water were fit into a gallon jug, the fresh water available for us to use would equal only about one tablespoon. InventorsToolbox: The Elements of Machines. Simple Machines: These devices were all in common use for centuries before Leonardo's time.

InventorsToolbox: The Elements of Machines

Each one makes work easier to do by providing some trade-off between the force applied and the distance over which the force is applied. Wheel and Axle In this machine a wheel or spoke is locked to a central axle so that when one is turned the other must turn. A longer motion at the edge of the wheel is converted to a shorter more powerful motion at the axle. In reverse, a short powerful force at the axle will move the wheel's edge a greater distance.

The Art of Using Humor in Public. The Art of Using Humor in Public Speaking by Anthony L.

The Art of Using Humor in Public

Audrieth Anthony L. Audrieth, 1515 Waverly Dr., Champaign, IL 61821 Copyright 1998 A.L.A., all rights reserved. Part 1. The Art of Using Humor in Public Speaking is just that. Using humor in public speaking can be very beneficial, both for the audience and the presenter. This article is dedicated to Dr. Never one to do anything half-way, he studied humor intently and applied his skills nationwide.

One other important point about Dr. Who is THE ART OF USING HUMOR IN PUBLIC SPEAKING for? For any person who must speak in public or private, to business or pleasure groups, humor is an invaluable indispensable tool for getting your message across. This short monograph is not meant to be a primer for budding stand-up comedians whose goal is 100% entertainment. While popular culture may well embrace questionable humor, it has no place in presentations that are designed to educate and uplift audiences.