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"SF is a controlled way to think and dream about the future."
- Gregory Benford
 |
| Half-Sphere Force Field | ||
| A protective force field that can manifest even as a half-sphere. |
Anybody can make a spherical force field, but I enjoyed this brief excursion into solid geometry from Heinlein.
| There flickered into being over the bench, hanging in the air unsupported, a silvery ball some two feet across... it made Don think of a Christmas tree ornament. ...Conrad bent over the controls. "Act two," he announced. "We now cancel out half of the locus..." Another shape took being, a perfect half-sphere otherwise like the last. |
| From Between Planets,
by Robert Heinlein. Published by Charles Scribner's Sons in 1951 Additional resources -
|
It is invulnerable to harm, and ordinary processes (like a burning cigarette) inside the sphere are uninterrupted. And how does it work?
"...There is no popular way to explain it. If you were willing to spend five hard years with me, working up through the math, I could probably bring you up to the same level of ignorance and confusion that I enjoy. Some of the tensor equations involved are, to put it mildly, unique..."
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'A moment ago it was squeezing silver toothpaste in a ribbon...'
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