The Strip method lays out the rectangles from left to right and top to
bottom in the order of the original data, like flowing text (other
directions are also supported). This allows the user to easily look up
a particular rectangle.
The number of items in each row is such that the rectangles are as close
to squares as possible. As the data are not sorted, a row can contain both
wide and thin rectangles, and the rectangles will not be as close to
squares as the Squarify method.