“Graphic Arrays” is about screen resolutions and aspect ratios and how these evolved over the laste decades. The left board is dedicated to more recent mobile vertical resolution ending at iPad retina. The right board represents the long history of desktop screen pixel sizes starting with the classic VGA (640×480) IBM standard from 1987 till todays common 2560×1600 desktop monsters.
Of course the DPI(PPI) has increased immensely over the years, especially with all the mobile screens recently. It feels weird to look at a 5:4 SXGA screen (1280×1024, my favorite!) today, almost portrait ration?!? At the same time when you cut a piece of paper in 16:9 format it looks super horizontal but we look at that ratio all day!