Have star and flag from me.
Well, i think that you've already mentioned a classic case, which is the one of the triangles in late '80s and 90's:
in general i'm convinced that Kenneth arnold's sighting played a lead role.
Once the term "flying saucers" has been known worldwide, then strangely the most spotted shapes in ufos have been the ones of saucers.
But actually, what he spotted was different from a "classic" saucer
In my opinion, in this case the only reliable stats are the ones of projects like the one of CNES/GEiPAN: once there's a serious case study's
result, then we are able to sleuth in it and to try to realize wat have been the trends.
Many shapes have been reported: domes, saucers, oval, cigar, cylinder, flat, conical, hat, saturn, sphere, egg, triangle, delta, boomerang, diamond,
building, and sometimes even horses have been spotted in fly (just kidding on this last one, ask Jamie Maussan for more infos
) and i'm sure
i'm forgiving many other shapes.
But the most underevaluated are the amorphic shapes, and that's sad to say the least, since they have been spotted (and caught on camera) even by
astronauts during official missions:
these so shaped object don't have the same appeal of an "independece day" shaped ufo, most likely because there's nothing, in their appearance,
that suggests an advanced tecnology. But they are
real ufos.
Besides, there are techincal facets of the issue: for example, many saturn shaped ufos are being spotted oin SOHO/LASCO images, but by people who have
no clue how does it works: as many cigar shaped objects often turn to be long exposure shots of spheres/orbs/ if not helicopters/planes.
What i mean is that the whole UFO phenomenon is affected by hoaxes,
misinterpretations and so on, due to lack of knowledge in NATURAL phenomenona of the researchers.
Another project worthy to be mentioned is of course the Hessdalen one:
here there are some videos to download, but there's a HUGE case study on it
Project Hessdalen - short films
Just my two cents.
[edit on 3/3/2008 by internos]