Some things are just naturally made for one another; shoes and socks, nuts and bolts, coffee and cream, pins and needles. Who decides? No one is given the duty of waking each day and declaring that certain words or ideas or concepts should be configured with each other. Time and usage, however, results in combinations more favored than others. Most slide off the tongue easily which encourages even more widespread use.

Another possibility is found in the grouping of objects based on characteristics such as fragrance, taste or color. Our early spring flowers showcase varieties of blues...