This is a really hard question that I've thought about many times. My quick answer is that I love piecing the quilt. It reminds me of watching a Polaroid picture transform in front of your eyes. But, I think I love the challenges the most. There's the challenge of finding the perfect fabric, the challenge of getting everything to match up correctly so the picture in your head becomes the quilt in front of you, the challenge of the quilting (oh, that's my biggest challenge) and finally the challenge of the finish..... everything exactly as you planned. If I didn't feel the challenge I'd get bored and find something else to do.