Fractal clouds (or dust) start forming
from a single user defined point P0(A,B,X,Y), and by numerous repeating
of some transformation we get some cool pics. Because of the fact that
we can follow the trail that start point is leaving behined (P0-start,
P1-1st iteration, P2 2nd, .... Px - wich are dots on picture) this pics
are also called orbitals (trajectories) of dynamic system.
To get a rude estimation of what A, B, X and Y are good to use - I
prepared you Clouds.xls. Sheets 1 to 6 shows computation sequence series
of here given pattern examples 1 to 6. X() sheets show graphic look of
computation sequence of poorly picked parameters (with some comment
why). Submission is 575k because of xls file.