advanced logo a language for learning Michael Friendly 1988 2 – Logo Basics 3 – defining procedures 8 – The World of Trees 8 x 3 spiral 4 x 4 spiral 18 pentastar 18 pentastar 2 32 RAY 49 spin times 49 spin times 49 spin times 49 spin times 49 SPIN8 69 POLY1 DIRECTION 47 SPIN RUN x 2 45 RESQUARE 44 SQUARE DASHED 38CROSS 33 SPIRAL 220_GROWTH 219 ANGLE5 217 TREE 215 TREE