Why do Analyze format images appear upside down in ImageJ?

Most image formats (e.g. DICOM) describe data starting from the
top-left corner and move from the top of the image to the bottom (much
as English readers start at the top-left corner, reading each line
from left to right). On the other hand, SPM96/SPM99/FSL expect image
to be in RAS format (lines going from left to right, then posterior to
anterior and finally inferior to superior). ImageJ (and several other
programs) do not take this into account, so Analyze images appear
upside down.