I don't know how a fly sees the world, but it might be like this...

While waiting for the moon to set, I decided to take a 360x180° panoramic photo from the top of a tripod stuck just outside the roof of my observatory.  When turned "inside-out", the panoramic photo is popularly called a "tiny planet" photo.

Most of the central part of the photo is the inside of my (cluttered) observatory.  The outside of the photo shows the horizon and sky.

Go to: http://astrocamera.net/2014/0531/index.htm to see a larger view and the original panoramic photo in an interactive panoramic viewer.