Galileo had a great analogy to describe the limits of our default perspectives.

Imagine you are under the deck of a ship moving with constant velocity (constant speed in the same direction) and you hold a ball up in the air and drop it. The ball moves vertically downwards proving the existence of gravity from your perspective.

Now, imagine you are a fish (with a special x-ray vision) and the ship is moving past you. Now you can see the ball move vertically and horizontally along the direction of ship's movement. So without any external point of reference, you won't be able to see other perspectives.

Though you have all the information in the world, the ship in the ocean has more perspectives.