But GEO600 - or any other experiment for that matter - cannot hope to probe to scales this small. This is where things get weird.
The GEO600 experiment can probe down to scales of around 10-16 meters, but if the noise it is detecting is due to the pixelated nature of space-time, what's going on? GEO600 is probing scales 10,000,000,000,000,000,000 times larger than the Planck Length, so the quantum "fuzziness" is operating at scales much larger than one would have thought (if space-time has quanta, quantum fluctuations should occur more toward Planck scales).
Now we enter the realm of bizarre physics, where our view of the Universe could change forever.
In the early 1990′s, University of Florida physicist Charles Thorn conceived the holographic universe hypothesis. In Thorn's view of the Universe, the 3-dimensional world we know and love is actually a hologram projected from the furthest-most reaches of the cosmos. The easiest way to imagine it is that we are contained within the Universe's event horizon and any 3D object we conceive (as 3D objects ourselves) are projected from the event horizon's 2-dimensional "shell." We are basically a projection.