In the first step the lower-middle element shifts to-centre. The central elements becomes upper left, upper left shifts to lower right and a new element appears at upper right. In the next step, upper right shifts to centre, central elements shifts to upper left, and upper left shifts to lower right while a new elements appears at lower, left position.
In the first step, the elements move from 1 to 4 - 6 - 7 - 3 - 1. The element at position 9 is replaced by a new one. In the next step, elements move from 1 to 9 - 7 - 4 - 6 - 1 and 3 is replaced by a new one.
All Ts, after they are added in the frame, rotate 90o CW or ACW at their own position in a fixed scheme: the lower-left, lower-right, central Ts rotate ACW and lower-middle, middle-left Ts rotate CW. A new T is added in a fixed scheme: If the number of Ts is odd, the last added T faces the T added before it; if the number is even, all Ts are paralled to each other.
The arrowhead attached to the circle reverse its direction in each step and rotates by 90o and 45o CW alternately. The lines inside the circle become one and two in number alternately and also rotate throught 90o in every second step. The does at the corner rotates by 45o CW in one step and move to the CW corner in the next.