IVY is a concept from TUe students for an external hard disk that visualizes the amount and structure of the data that are on the disk, using the SequoiaView treemap algorithm. SequoiaView can be used to locate large files that haven't been accessed for a long time, or to quickly locate the largest picture files on the hard drive. The hard disk is fitted with an oled display to continually update its appearance to represent the contents.

This concept and similar ones (flashbag usb drive, insync twisted hard drive, hard drive capacity gauge) can be found on infosthetics, everybody's favorite information aesthetics website.