Pattern, like texture, is used to create visual interest. Unlike texture however, pattern does not invoke a tactile sense. Although textures can contain pattern-like elements, not all patterns are textures. Here patterns and variation are used to create interesting shapes with unity.
.Braden Kowitz puts it another way: "I think of teaching design as kind of like learning to ride a bike. I can give advice about riding a bike, but it’s not until you get on the bike and try to ride that you can learn how."