Babylon By Bus is a live album released in 1978. Its cover came with a special design feature. Wikipedia:
The windows of the bus on the front cover were cut out, revealing part of the inner sleeve. As this was a double album, the listener had a choice of four different scenes to view through the windows.
Try to do that with a jewel case, not to mention with an iTunes jpeg!
The letters on the cover appear to be painted, but closely modeled after the tube-like Pluto.
Art direction and graphics by Neville Garrick. Tour photos by Junior Marvin, Kate Simon, Laurie Lewis, Neville Garrick.