In poetic language, in which the sign as such takes on an autonomous value, this sound symbolism becomes an actual factor and creates a sort of accompaniment to the signified.
Roman JakobsonLanguages differ essentially in what they must convey and not in what they may convey.
Roman JakobsonLinguistic sounds, considered as external, physical phenomena have two aspects, the motor and the acoustic.
Roman JakobsonEvery linguistic sign is located on two axes: the axis of simultaneity and that of succession.
Roman Jakobson