Picture a column of people on the move, and one small group riding well out in front of it. They are the first to see what is ahead, and from behind they look odd, because they are already somewhere the rest of the column has not reached. Every use of avant-garde keeps that shape: something or someone is out in front, and the strangeness others feel is just the distance between them.
From the word’s history
From Old French avant (before, in front) + garde (guard) — the troop riding at the very front of an army. English vanguard comes from the same source.
來自古法文 avant（在前面）＋ garde（衛隊），原本指軍隊最前頭的那一支先遣部隊。英文的 vanguard 跟它同源。所以「走在隊伍最前面」不只是個比方，這個字本來就是這樣用的。
Wiktionary entry for avant-garde (packet evidence kaikki:3f6f69a190036ae4:703307495): From Middle English advaunte-garde, from Old French avant-garde, from avant + garde. Doublet of vanguard.
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