The preschool period is a critical stage where children's cognitive and emotional development progresses most rapidly, absorbing information like a sponge. In this period, visuality plays the most vital role in the way children perceive and interpret the world. Therefore, the artistic quality of illustrations in books presented to children holds immense importance both for fostering lifelong reading habits and supporting healthy developmental milestones. The master's thesis completed by Buse Özek in 2015 provides a comprehensive and analytical examination of the multifaceted effects of illustrations in preschool literature.

The research emphasizes that an illustration is never merely a decorative element adorning text; it is a visual language and a potent medium of communication in its own right. High-quality illustrations reinforce the events, emotions, and concepts conveyed in the narrative, cementing them meaningfully in the child's mind. According to the study, children construct mental representations of objects through illustrations, which directly stimulates their cognitive and conceptual development. Furthermore, illustrations assist children in decoding unfamiliar words within narrative contexts, thereby expanding their active vocabulary and language competence.

As one of the most expressive components of illustration, color exerts distinct psychological influences on early childhood development. Vibrant and luminous hues sustain children's engagement with the book, while warm tones such as red inspire alertness and energy, and cool tones like blue evoke a calming, centering sensation. The deliberate and informed application of color enhances the narrative's underlying emotional tone and contributes to the child's affective balance.

The study also addresses the sociological and cultural dimensions of children's literature. Özek underscores the critical role visual narratives play in transmitting cultural values and shared societal heritage. Rather than relying exclusively on Western-centric drawings and tropes, integrating authentic cultural figures such as Nasreddin Hodja and Keloğlan enables children to develop cultural awareness, an intuitive sense of identity, and healthy belonging.

Ultimately, Buse Özek's work proves that choosing children's books is far more than an incidental bedtime routine; it is a deliberate pedagogical process that enriches all developmental domains. Illustrated books must be designed with deep sensitivity to children's age-specific cognitive levels, pedagogical needs, aesthetic standards, and cultural realities.

We extend our sincere gratitude to Buse Özek for this valuable study. The complete thesis can be accessed via www.tez.yok.gov.tr using reference code 424957.