Manuscript illumination in the Hiberno-Saxon style followed strict rules to create intricate and highly detailed designs. These rules included the use of intricate interlacing patterns, the incorporation of animal and plant motifs, and the use of vibrant colors. The illuminators also used a variety of techniques, such as outlining, cross-hatching, and stippling, to create texture and depth. The text was often written in a highly stylized script, and the illuminations were carefully placed within the margins of the page to create a sense of balance and harmony. Overall, the strict rules of manuscript illumination in the Hiberno-Saxon style resulted in some of the most beautiful and intricate illuminated manuscripts in history.