Helpful Links
Wikipedia Page on Overlapping Circle Grids
Youtube video - Sacred Geometry: Seven Overlapping Circles
Overlapping circles in a grid can produce stunning, visually pleasing geometric art. Examples of this techniques can be seen in Ancient Egypt, Rome and in Hindu Temples.
Create a "Seven Circle Flower" or create a more complex pattern of your own. Note that all the circles are the same size, and their centers are on a grid. As you change the distance between the grid points, the pattern changes in interesting ways.