White space (or negative space) is the design term used for unused space ... Commonly, the larger your poster is the larger your font will be. Example of font sizing on a 36"x48" poster: To be legible ...

36" by any size (Example Sizes: 24x 36, 28x36 ... size of 56", but there are ways to print a poster that is longer than 56”. The easiest way to design a poster longer than 56” is to design the poster ...

there have been plenty of examples to restore my dwindling faith in film poster design.