Invisible

Another report about a UFO not seen by the naked eye, only to appear later in photographs.
The locale of this, Tower Bridge over Thames in the heart of London made me think: How many invisible crafts fly over us, how many invisible beings walk among us and are briefly made visible by a fluctuation of the god-knows-what field or pure interdimensional coincidence?
Are we indeed living in a world defined by our brains, which conveniently shut out all "out of norm" stimuli? Is this why children are reputed to see "more"?
Is the m-theory correct? Is our universe spearheaded by a vertical universe, connecting us with at least 9 others?
I hope H.P. Lovecraft was partially wrong, but then again, it does not seem so..

"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents. We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far. The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the deadly light into the peace and safety of a new dark age."

H.P. Lovecraft The Call of Cthulhu , 1928