Patterns for flow control and bioadhesion control

An article comprising:

• a first plurality of spaced features disposed on or in at least a portion of a surface of the article;
• the first plurality of spaced features arranged in a plurality of grouping;
• each grouping being a repeat unit of a plurality of repeat units that is repeated across the surface;
• the first plurality of spaced features within the grouping being spaced apart at an average distance of about 1 nanometer to about 500 micrometers to define a continuous path that traverses the first plurality of spaced features;
• where the continuous path extends across the portion of the surface of the article;
• each spaced feature having a surface that is substantially parallel to a surface on a neighboring spaced feature;
• each spaced feature being separated from the neighboring spaced feature;
• where the article comprises grids;
• wherein each grid encompasses the plurality of repeat units;
• and wherein the plurality of repeat units in adjacent grids are inclined at an angle of 50 to 150 degrees to each other.