This background image is the start-up screen.
It's loosely based on the graphic seen on HAL's Brain Room door.
For Mac, download the appropriate file below and drop into you System Folder to make it active. When you start your MAC, this image will replace the Welcome To Macintosh screen. To deactivate, remove it from the System Folder.
Or you can download the 640x480 jpg version here.
|640x480||DOWNLOAD Start-Up or JPG|