1. Use of single whole piece of wood for one sculpture without attachments
2. Self-made tools and instruments for wood sculpting
     - Over 250 kinds of sculpting knives alone, made by grinding with metal files
3. Movements and life creations based on flawless representation of realism
4. Realization of genuine and diverse creations derived from artistic craftsmanship
5. Continuous devotion toward the pure art with ceaseless efforts and     experimentation