Apple Insider posted a review on the new iPod Nano

Since the iPod nano first appeared in 2005 as the replacement for the hard drive based iPod mini, Apple has frequently experimented with its design, trying to pin down how to best target the market for a device more sophisticated than the screen-free iPod shuffle, yet sufficiently differentiated from the high end flagship iPod: a compact, simple device with a functional display.

The first iPod nano was incredibly thin due to its use of flash memory, and delivered a (1.5 inch, 176x132) color screen the mini lacked. The second introduced an aluminum case in a range of colors. The third experimented with a smaller form factor with a nearly square shape that more closely associated it with the design of the classic iPod. However, it was not well received, despite delivering new video playback on its significantly larger and sharper (2 inch, 320×240) screen.

  Apple iPod Nano (2012) Review