This is a speculation I mentioned in a 2012 article on isotropy on arxiv, and in an allometry article also on arxiv (v17) in 2015 and in some earlier versions. Though as yet there is no theory of DE, it seems DE involves isotropic expansion of space everywhere and at all scales. If that expansion results from light increasing the radius of the universe, then the scale is both cosmological (the universe is expanding) and microscopic (photon size). (That relates to a suggestion of Thomas Gold in a 1962 article on the arrow of time that expansion might be due to microscopic effects.) If the background is moving everywhere then could it be the interference pattern exhibited in the two slit experiment is the moving DE background? I analogize this idea to the tension between the geocentric and heliocentric reference frames; the innovation of Aristarchus and Copernicus substituted Earth’s contextual background (Sun) for the Earth as a stationary reference frame. The idea here in relation to the two slit experiment is to switch reference frames, look at the background, not the particles. Is the background moving possible? If it were possible, is there a test to see if that accounts for the observations in the two slit experiment?