You descend the staircase, as previously using light provided by Kenneth's gun....
As you emerge into the basement there appears to be a feint flickering light coming from the 6ft wide, 7ft high archway to the left.
Cautiously peering around the edge of the archway a curious sight awaits you across the far side of the basement.
Attached to, or part of, some sort of 'Heath Robinson arrangement', is a 3ft diameter gyroscope frame, inside which 3 rings rotate slowly (one ring in the x-plain, one ring in the y-plain, and one ring in the z-plain), about 1 rpm.
Extending from the top of the 'Heath Robinson structure' which is predominately behind the gyroscope frame, is the veined structure which disappears into the stone of the ceiling.
The whole structure emits a low level of illumination, the rotation of the rings causing the flickering effect.
The intensity of Trump energy down here is significantly greater than on the floor above.