I think it's the impact the paper has, how the paint spreads (or doesn't) depending on how damp the paper is. It's hard to see and hard to learn to perceive, but part of the unique character of watercolor. -- Marion Boddy-Evans, About.com Guide to Painting
Watercolor permits and facilitates dropping color into wet washes to produce color blends, flows and blooms impossible in other media. It is heavily weighted toward technique and control. Learned skill is instantly evident in the work. Because it is more difficult, it is appreciated more. -- Jon Rader Jarvis

