So let them be beau . Let them be the exception. Let them be the beautiful mistake you never want to correct.
French grammar is a Cartesian machine, precise and unforgiving. It wants agreement. It wants logic. It wants the adjective to bow to the noun, to bend itself into the correct shape, to multiply when the subject multiplies. But “ils sont beau” defies that machine. It says: no, they are not many beautiful things. They are one beautiful thing, together. ils sont beau
Ils sont beau — not a grammatical error, but a metaphysical statement. So let them be beau