The Holometer will consist of two 39 m arm-length power-recycled Michelson interferometers, similar to the LIGO instruments. The interferometers will be able to be operated in two spatial configurations, termed "nested" and "back-to-back". According to Hogan's hypothesis, in the nested configuration the interferometers' beamsplitters should appear to wander in step with each other (that is, the wandering should be correlated); conversely, in the back-to-back configuration any wandering of the beamsplitters should be uncorrelated. The presence or absence of the correlated wandering effect in each configuration can be determined by cross-correlating the interferometers' outputs.