After answering each one of these four questions, the analyst will have arrived at what we call the proto-uniskript alphabet and will undergo a process of elimination of redundancy. Only the contrastive features required for distinguishing a phoneme from all other phonemes in the language will be kept in the final product.
Sound-shape Congruency
Additionally, to the above referred indexical nature, uniskript signs are also sensory congruent. Each shape incorporates some of the cross-modal correspondences previously established in the literature of sound symbolism. Saussure's claims that there is no link between a thing and its name constitute the basis for one of the most fundamental assumptions of the modern linguistics: the arbitrariness of the linguistic sign \cite{Lepschy_1985}.
Nevertheless, the debate about sound-shape-meaning symbolism is at least as old as Plato's 400 BC work called Cratylus \cite{BAXTER} . In this famous dialogue with Hermogenes, Cratylus hypothesizes that the movements of the mouth and tongue during the production of a sound somehow resemble some correlate semantic concepts. According to him, [r] would be naturally related to 'motion, rapidity' while [o] would naturally point to 'roundness'. Later, Sapir's research \cite{Sapir_1929} demonstrated that English speakers systematically associate the back vowel /a/ with 'largeness', but the front vowel /i/ with smallness. According to Monaghan et. al:
"It is a long established convention that the relationship between sounds and meanings of words is essentially arbitrary—typically the sound of a word gives no hint of its meaning. However, there are numerous reported instances of systematic sound–meaning mappings in language, and this systematicity has been claimed to be important for early language development." \cite{Monaghan_2014}
The phenomenon of sound-shape symbolism was explored also by Köger \cite{Fontana_2013}. His seminal experiment (1929) showed that most Spanish native speakers matched the nonword maluma with rounded shapes, and takete with angular shapes. The experiment, later called "kiki-bouba effect", as in Figure \ref{435482}, was replicated across a wide range of unrelated languages and showed that people tend to match words and such figures far more often than chance would predict.