I have David's book "Clown Star"...it's okay I have been clowning for 19 years and didn't find any new ideas there.
I don't see any book as a clown bible, I have fallen in love with theater clowns lately...
The book I love, read cover to cover and the 50 clown exercises are brilliant! I took a work shop with Jeff Raz from the SF Clown Conservatory and some of these exercise I have used and found very effective.
The nice thing is Alan has this book on line free if you like to set at your computer and read its almost 600 pages so I bought a copy to take with me and quick reference. Its called "Angers can Fly" . It is a Modern Clown training guide, a novel that follows 10 clown street performers sharing real life experience and has clown bio's so it is like 3 books wrapped as one.
http://groups.yahoo.com/group/AngelsCanFly/
Alan Clay's latest book on clown, Angels can Fly, which will be published in May 2005, promises a mix of fiction following the adventures of ten clown characters, some personal clown anecdotes, a total of 50 practical clown exercises, and some theory on the nature of modern clown.
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Jewls