We found 4k to be enough in most cases and sometimes even 3k before you would see a difference.  It surprised me as most people will tell you 65mm film has an intrinsic detail level around 8k or more.  But the film grain also interferes with any simple equivalence like that.

The shot over the sea of lava has a moon in the sky that's quite large. This is because the moon was very close to the earth back in those days, and also red with molten rock. I hired an illustrator to make it as accurate as possible.

George Casey, the director of the film, gave me a lot of freedom to design the shots we did. There were quite a few beyond those seen in the demo clip.

The view at the end of the main demo clip shows an illustrated view of the layers inside our world. For this I spoke to scientists at CalTech to get accuracy. At the time this came out it was the most accurate view of the scale of elements ever done. This type of film is very difficult and expensive to create, and in fact was until recently still in rotation at imax theaters in science museums around the worldE

Even larger segments of the film were those involving earthquakes in Turkey.

This was a pleasure to work on as the filmmakers at Graphic Films were such professionals (founded in 1941!). Les Novros, founder of Graphic Films, was one of the greats of filmmaking and at USC inspired students such as George Lucas. He made some of the first IMAX films. This one was funded through the Geographic Society, who in fact also interviewed me for their tv show.

Les Novros on Wikipedia.