Here’s a video showing Cheng Man Ching in action. One of Yang Chengfu’s later students, Cheng Man Ching modified his teacher’s long form by having a more upright stance and smaller movements. He also created a shortened version of the traditional form which missed out some movements and repetitions.
The ‘square form’ looks like a fascinating training exercise:
I must admit to finding this rare form absolutely fascinating and beautiful. It also looks incredibly difficult, though at least it can be practiced in a small space: