Circular From

This is original circular form. 
From Jiang Rong Qiao (also anglicized as Chiang Jung Ch'iao)
He was the first of the Bagua masters to create one main form from all the shorter forms and drills.

So this is now our mother form in Bagua, and should be learnt first.
If you're new to Bagua, start with the Basics category.