In one phase of that work, the old foundation was gone and the new foundation between the house and the new footing was not yet installed. As seen in the two snapshots, there was a gap of a foot or more between the bottom of the house and the new footing.
As a Halloween evening stunt, the owners fitted an opaque sheeting in the footing-house gap and put glowing lights behind it. This created an “eerie” organge-ish glow and perhaps created the illusion of floating. As seen in these snapshots, I tried rather unsuccessfully to photograph that floating effect.