Although many classes claim to be teaching taijiquan, very few are. In order for the art to qualify as taijiquan, it must to the essence of the art:
- Move your body in accord with The Tai Chi Classics
- Train all 13 areas of study
- Follow Yang's 10 Essentials
- Maintain medically-sound body use
- Functionally apply the art in a skilful 'taijiquan' way
- Employ the taijiquan principles at all times
- Embody the teachings of Taoism
- 13 patterns should be made manifest at all times
- Every movement is a whole-body movement
Providing these criteria are met, you have an immense degree of freedom for personal expression and individual interpretation.