Graphic design firm Dowling Duncan created a remarkable entry for the Dollar ReDe$ign Project. The series of bills are intended to be both educational and easy to use.
Dowling Duncan explains more:
Why the size? – We have kept the width the same as the existing dollars. However we have changed the size of the note so that the one dollar is shorter and the 100 dollar is the longest. When stacked on top of each other it is easy to see how much money you have. It also makes it easier for the visually impaired to distinguish between notes.
Why a vertical format? – When we researched how notes are used we realized people tend to handle and deal with money vertically rather than horizontally. You tend to hold a wallet or purse vertically when searching for notes. The majority of people hand over notes vertically when making purchases. All machines accept notes vertically. Therefore a vertical note makes more sense.