because the third fabric from the right has a larger print than the others, small squares of the fabric will have different looks...if the square hits the white, it will show up as all white while if it hits the darker part of the pattern, it will come across as darker. This will add some variation in the quilt overall - not necessarily a bad thing, but something to think about. All the other black/white fabrics have a smaller overall print so won't produce the same variation.