"Other" forms of life may be all around us, bisecting realities and unrecognizable. Like frequencies to the radio, if the equipment can't tune it in, you'll never get the program. One never knowing of the other. One knowing, the other not. Endless possibilities.
If a three-dimensional beach ball briefly passes through a two-dimensional universe, 2-D person may suddenly see a circle appear and disappear... A ghost? A UFO?
The article is very interesting and I believe plausible. Why not?