Even the largest computer screens fall short of the flexibility of a large table of index card piles. You can lay out piles in a 2D array or 2D separated groups

Even the largest computer screens fall short of the flexibility of a large table of index card piles. You can lay out piles in a 2D array or 2D separated groups. Then resuffle the piles. Each pile can be ordered by importance, time, or expository order.