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Basically a world that cannot be mapped.

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    $\begingroup$ Please add more details to your question. $\endgroup$
    – L.Dutch
    Feb 28, 2020 at 22:07
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    $\begingroup$ Oceans change all the time. Simply don't have all those pesky islands and other landmarks. $\endgroup$
    – user535733
    Feb 28, 2020 at 22:30
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    $\begingroup$ There is one example in science-fiction. Stanislaw Lem's Solaris. This is a planet covered by a strange ocean where multitudes of classes of bizarre structures are constantly forming, breaking down and reforming. $\endgroup$
    – a4android
    Feb 28, 2020 at 23:03
  • $\begingroup$ Hi it with a very big rock. $\endgroup$
    – pHred
    Feb 29, 2020 at 1:15

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Sure you could have an ocean. Maybe icebergs floating around. That would be fine. Very serene. Walruses. Or you could have a

Lava planet!

lava planet https://en.wikipedia.org/wiki/Lava_planet

Chunks of solidified rock bob thru the molten lava, smashing into one another! Volcanos rise up from the core thru the lava and spew hotter lava and clouds of sulfurous ash. Meteors splash down! Need I mention lava monsters?

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  • $\begingroup$ Anything fluid without rocky formations will do. Gas giants included. $\endgroup$ Feb 29, 2020 at 0:18
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All planet is ocean with floating islands!

In Russia there is Kravtsovo lake with natural floating isle made from turf.

in 2017 in 2018 in 2019

Since isle is changing its place every few month, mapping it is wrong approach. Imagine, that majority of surface of your planet is ocean with islands like this.

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Thick atmosphere!

enter image description here

Any planet with a thick, turbulent atmosphere will always appear different on the surface. For example, the gas giants may have consistent belts / zones of gas, but individual storms appear and reappear constantly. Arguably, a very windy would could experience much more visual variation, resulting in an ever-changing surface.

For example, look at Neptune's immense Great Dark Spot, a storm larger than Earth which only marred Neptune's surface for ~5 years.

If you don't want your world to be a gas giant, check out our neighbor Venus. While we can map its surface with radar, the atmosphere is the only part that's visible to the unaided, optical eye. Since it's constantly changing, we have few visible light maps of Venus, and none that stay accurate for very long.

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when you say changing the appearance of the planet and reforming it, it makes me think of displays that change colors. maybe putting them on lifts that move them up and down randomly. making the surface look like a blocky colorful sea. Or a vast swarming sea of nanites assembling different shapes with colors and constantly reshaping and changing them. this is the technological option, however nanites are a bit handwavium, since they don't and may never exist.

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