This isn't a fair comparison, though — we're talking about the phenomenology of three lights in the sky, not 3 carefully arranged Pac-Men accompanied by 3 carefully arranged V's.
Three lights in the sky will, by definition, form a triangle. It is, not surprisingly, the simplest arrangement of lights that the mind can convert into ' a craft'. The brain assumes the 3 lights are connected, and 'sees' a craft at whatever alignment the lights are at. If the lights start to appear more in a straight line, the brain assumes the 'craft' is becoming edge on....and so on. Whatever the 3 lights do will be converted into some orientation of 'triangular craft'.
It thus does not surprise me in the least that 'triangular craft' form so many UFO reports. And the tendency of the brain to 'fill in' the edges of the craft is known physiology. My diagram was a perfectly 'fair' illustration of just that. The brain does fill in the details...that is well known science. There is no 'white triangle' in the image...other than one the brain has created. There are numerous similar examples....I just provided the first one I came across.