As humans we understand that interactions alter how we perceive one another, significantly and quickly building or compromising a relationship.

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We think dark matter is a particle too, it's just an odd form of matter in the fact that we don't perceive it very readily.

BBC: Dark Matter: Experiment to shed light on dark particles

Research suggests that the way we wish to perceive ourselves has a profound impact on how we behave.

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''All members should be aware that how the people of Scotland perceive the Parliament and how we relate with them is in our hands and that we should use that responsibility wisely, '' he said.

BBC: Photo of Scottish flag

At the same time, we know that Americans more than people in other countries perceive IKEA as a source of home furnishings in their starting-up phase.

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But it can be argued that it will make the EU more relevant by changing the way we perceive our lives, our priorities and our place in the world.

BBC: Viewpoint: EU finds its role

Einstein's general theory of relativity states that objects with mass cause a curvature in space-time, which we perceive as gravity.

WSJ: Einstein Proved Right on Gravity��Again