#336 & #337 Interesting, is the Arago Spot the point (?) same geometry multiply size. Can energy be extracted? It may also show absorption emission periodic resonance compression fields and waves of different densities. Going in and out. Spot' physics being the same for all sizes in Nature. The geometry of the Arago Spot is a collision, and collision laws are the same and produces the same and similar event through out size's'. The collision of 'light' (geometry) is the same for mass collision geometry.