The ERANOS foundation, based in Switzerland, is an organization that is primarily concerned with the work of Carl Jung, and it's extensions. Since Jung contributed to Wilhelm's I Ching, and the book is often used in analysis, the Foundation set-up an I Ching study group from which emerged a new translation of the I Ching. This translation has attempted to maintain the original chinese format by giving as close as possible a one-to-one translation of chinese to english.
Although difficult to read, it is one of the best sources to date to get a 'good' idea of the metaphors under consideration, and so in this current work I have used the descriptions given of the names of the hexagrams in the I Ching. The reasoning being that it is these descriptions that existed prior to King Wen and the Duke of Chou's extentions of the I Ching with judgment, image, and line texts circa 1100BC and thus best encapsulate the generic characteristics of the hexagrams.
By using the supplied information one can see that Wilhelm selected those aspects that got a specific point across rather than include 'secondary' aspects; but to appreciate the 'whole' we need all of the aspects. For example, hexagram 01 is named Ch'ien, which Wilhelm translates as "The Creative", and in the more 'popular' books this is given a highly positive meaning. But through the ERANOS text, which gives the full list of Chinese meanings, things are not necessarily that positive:
"CH'IEN: spirit power, creative and destructive; unceasing forward motion; dynamic, enduring, untiring; firm, stable; heaven, sovereign, father; also: dry up, parched, exhausted, cleared away. The ideogram: sprouts or vapors rising from the ground and sunlight, both fecundating moisture and scortching drought." ERANOS p94.
In this we see the 'excessive' character of this hexagram - an extreme bias to 'yang-ness' to the extent that it is unbalanced. This point is recognized by the added texts where there is an emphasis on maintaining balance at all times - dont get too carried-away as the hexagram has destructive aspects.
(Note that, for hexagram 01, the ERANOS text then translates the name into the english word "Force", which I think also misses the point)
Reference : Ritsema,R., & Karcher,S.,(1994) "The I Ching" Element books. ISBN 1-85230-536-3.