Luckily O Sensei had a significant portion of his work recorded so not everyone can be fooled or limited by the status quo. To give due credit although not in their entirety, different parts of O Sensei's training have been passed down to different teachers. His contracted activations, part parcel to his size, concentrated energy mostly within himself ‘reflecting between heaven and earth.' Whereas his decontracted activations, the majority of his kata, concentrated energy through himself ‘from heaven to earth.' I'm much taller than O Sensei so I'm able to train contracted activations through rather than within. At the highest levels of energy, the ‘integrity' of heaven, man, and earth begin to disappear where the physical demands and the appearance of through and within can become indistinguishable. I know this probably doesn't make sense to anyone here but I find creating the description helpful if only for myself and my own ability to teach down the line in person.