The Zen what we practice today is exactly the same practice what the Buddha went through long time ago. The key points are:

Master Taisen Deshimaru

• an upright, immobile, relaxed posture, free from tensions caused by desires to escape or to achieve something . . . . .

•  A calm and regular deep breathing, which focuses and calms the mind.

•  Being undisturbed and present in body and mind creates an atmosphere of clarity and joy. Our thoughts and emotions can be seen as what they really are : clouds moving on an endless vast sky, reflections in a mirror.