Given the following context:

There was considerable overlap between panel painting and illumination; van Eyck, van der Weyden, Christus and other painters designed manuscript miniatures. In addition, miniaturists would borrow motifs and ideas from panel paintings; Campin's work was often used as a source in this way, for example in the "Hours of Raoul d'Ailly". Commissions were often shared between several masters, with junior painters or specialists assisting, especially with details such as the border decorations, these last often done by women. The masters rarely signed their work, making attribution difficult; the identities of some of the more significant illuminators are lost.Netherlandish artists found increasingly inventive ways to highlight and differentiate their work from manuscripts from surrounding countries; such techniques included designing elaborate page borders and devising ways to relate scale and space. They explored the interplay between the three essential components of a manuscript: border, miniature and text. An example is the Nassau book of hours (c. 1467–80) by the Vienna Master of Mary of Burgundy, in which the borders are decorated with large illusionistic flowers and insects. These elements achieved their effect by being broadly painted, as if scattered across the gilded surface of the miniatures. This technique was continued by, among others, the Flemish Master of James IV of Scotland (possibly Gerard Horenbout), known for his innovative page layout. Using various illusionistic elements, he often blurred the line between the miniature and its border, frequently using both in his efforts to advance the narrative of his scenes.During the early 19th century, the collection of 15th- and 16th-century Netherlandish cut-out, as miniatures or parts for albums, became fashionable amongst connoisseurs such as William Young Ottley, leading to the destruction of many manuscripts. Originals were highly sought after, a revival that helped the rediscovery of Netherlandish art in the later part of the century.

answer the following question:

What is the name of the man that used an innovative page layout that often blurred the line between the miniature and its border? 

James IV