What is now proved was once only imagined.”- William Blake.

william smith
4 min readJan 16, 2019

“To see a World in a Grain of Sand

And a Heaven in a Wild Flower,

Hold Infinity in the palm of your hand

And Eternity in an hour.”

When William Blake wrote those words in his “Auguries of Innocencein 1803 he likely didn’t imagine we would one day have the technology to actually “see a world in a grain of sand” but with Gravity Probe B we pretty much do.

The Gravity Probe B was a satellite-based mission to test two unverified predictions of Einstein’s general theory of relativity:

The mission was accomplished by measuring, very precisely, tiny changes in the tilting of the spin axis of gyroscopes contained in the Gravity Probe B satellite orbiting Earth at 650 km (400 mi) altitude, crossing directly over the poles. The gyroscopes were intended to be so free from disturbance that they would provide a near-perfect space-time reference system. This would allow them to reveal how space and time are “warped” by the presence of the Earth, and by how much the Earth’s rotation “drags” space-time around with it. ( https://www.nasa.gov/vision/universe/starsgalaxies/28mar_gamma.html)

In effect the Gravity Probe B enabled scientists “to see a World in a Grain of Sand” where that grain was fused quartz gyroscopes created for Gravity Probe B. The gyroscopes were the most nearly perfect spheres ever created by humans. They differ from a perfect sphere by no more than 40 atoms of thickness, about 40 fifty millionth (40/50,000,000) of a centimeter.

One of the fused quartzgyroscopes is pictured here refracting the image of Dr. Einstein in background.

Mathematician/Physicist and William Blake scholar, Jacob Bronowski tells us Blake’s “mind was all visual and visionary.” This is why poetry like that of Blake’s is so important. It emboldens us to imagine the unimaginable so we might. “ ‘see’ a World