I added some more trefoils to my table runner, and have just turned the corner of the third column:
After this, the fourth and fifth columns will taper downward, with the fifth column acting as a border. Then I will need to double the length of the runner to span the other half of the table. Here is how it will lay on the table:
As you can see, there is still a long way to go. I probably won't be finished with it until sometime next year.