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None. Perceptions are like fingerprints, inexplicably unique.

Ex: Jane, Dick, Tom and Harry are sitting around a table, looking at a glass of water in the center. Jane sees the lights of the kitchen reflecting in the water. Dick sees the dust that's settling at the bottom of the glass. Tom sees his grandmother's 50th birthday party, when a similar glass shattered on the floor. And Harry, who walked a mile to get there, is pretty damn thirsty and waiting for the game to be over so he can have a drink.

All observations are dependent upon the person's vantage point as well as the reference information locked in each observer's brain. Since no two people can stand in exactly the same spot and have the exact same experiences, their observations can never be exactly the same. They can be similar (i.e. everyone can look at a glass of water), but no two people will ever see exactly the same thing.

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The speed of light in Free space has the same value for all observers.

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12y ago
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15y ago

The speed of light.

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Q: Which quantities is always the same to all observers?
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