If E=MC^2 essentially states that mass and energy are the same thing in different forms.

Is it possible to say from another perspective that energy is all around us in the form of that building or that fork or that bird????

Yes.
It is possible.
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And what is more it would be true; as far as science can determine, matter is just a very concentrated type of energy.
Conversely energy is a diluted form of matter, and even light or other radiation creates its own gravity as if it had weight- but photons account for only a very tiny fraction of the gravity of the universe.
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I thought photons were virtually massless :confused:

Originally posted by eburacum45
And what is more it would be true; as far as science can determine, matter is just a very concentrated type of energy.
Conversely energy is a diluted form of matter, and even light or other radiation creates its own gravity as if it had weight- but photons account for only a very tiny fraction of the gravity of the universe.[/url] This is wrong. Photons have no mass and by extension create no gravitational field of their own.

no mass, but yes gravity.

Sorry, I should explain myself a bit better- mass can be converted into energy and vice versa; if this happens inside a closed system the overall gravity doesn't change.
A perfect example of a closed system is a black hole-
as mass falls into a black hole, it is disrupted by tidal forces and by the time it reaches the singularity it will exist as energy- yet the gravity of the black hole remains the same whether the infalling energy is mass or the mass is energy.

photons. as you say, have no detectable mass.
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