For example, here's the art description for Grixis Panorama:
Color: Land associated with black, blue, and red mana
Action: Magic has done a zillion landscapes. This one is a little different. It represents the sky itself, high above Grixis. Show a "one-point perspective" of a Grixis skyscape, with the vanishing point low in the frame. A little bit of terrain can be seen toward the bottom of the frame: dark seas, jagged mountains, and the festering "Dregscape." Grixis's sky is riddled with pink heat-lightning and black, roiling clouds, so a sense of that is important as well.
Focus: the scene
Mood: Inside the darkest storm, looking down on the darkest land.
So the concept is that the Grixis Panorama includes all of the lands of Grixis, but "zoomed out" so far that the sky itself dominates the picture. But when the card gets sacrificed to fetch a specific land, you're zooming back in to the Swamp, Mountain, or Island of your choice. Until then, though, what you see is mostly sky:
Art by Nils Hamm
Now, here's the other four. Ideally, you should be able to immediately identify which shard each panorama is associated with!
Art by Jaime Jones
Art by Franz Vohwinkel
Art by Donato Giancola
Art by Hideaki Takamura