The document discusses the principles of unity and proximity in design. It provides definitions of unity from online and the author's perspective, emphasizing that unity is achieved through the correct application of design principles. Proximity is described as grouping related items together so they are perceived as a cohesive unit. Examples demonstrate similarity, continuity, alignment, and proximity through the positioning of shapes, colors, and objects. The document concludes by contrasting organized and disorganized information grouping to illustrate effective proximity in poster design.