Ludwig Wittgenstein put together a children's dictionary. From the preface:
· Again and again psychological principles (where will the student look for the word, how does one guard him against confusions in the best possible manner) clash with grammatical ones (base word, derivative) and with the typographical utilisation of space, with the well-organised appearance of the printed page, etc. Thus it happens that the superficial critic will meet with seemingly arbitrary inconsequences everywhere, but those inconsequences are caused by compromises between essential viewpoints.
Form vs. Substance! Cat vs. Dog!
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