A Bigger World created by Lawrence Bailey Bangs, who resides in Vermont with his wife, Joan. Lawrence taught physics at the Univ. of Mass and Williams College prior to founding Wildridge Academy, where he homeschooled all 5 of his children 30 years ago. It not only has beautiful graphics, but as you'd expect from a good teacher, it has a clear, intelligent trigonometry section, explaining the measurement of angles and calculations which I could never have understood in high school. No one asks more of higher math than for it to mean something in practical applications, such as the above-mentioned distance calc or celestial navigation used by sailors and aviators. He has developed a wonderful program for teaching nearly any beginner how to draw using charcoal.
Drawing is the gateway skill to art.
He carries this through in his product. The video is clear, perfectly paced and very well done. Each step is explained and demonstrated without belaboring a point. The use of the artist's grid, squint sheets and preparing the surface is demonstrated with each project and we progressed through the first 3 exercises and found our results equal to our expectations. With practice, one could become very adept at drawing in this fashion.