The batik nickel quilt that I showed on my design wall has been in "row" form for at least 3 years. I have hung the rows on my design wall at various times over the last 3 years thinking I'd work on the quilt. Two weeks ago, I finally attached the rows together, hung the flimsy on the wall, sat down, inspected my work and was very pleased with myself. The next day, the NEXT day, I looked up and discovered that one of the blocks was assembled wrong.
See the middle top. It is supposed to look like a flying geese, not two half squares side by side! Now, I had looked at these blocks and rows for weeks and weeks. How did I miss it? I considered leaving the mistake because the block was in the center of the row. In the end I fixed it. I can't guarantee that I didn't curse and mumble but I did fix it.