This manuscript examines and explains the role of sketching as part of the creative design process, especially during its concept phase, when the new idea/solution is formed. The main focus of the study is the visual form of ideation, known as “sketching." This thesis also presents examples of practical ideation sketching techniques, analyses them, proposes the scientific explanation of mental mechanics behind them, and provides the perspective of cognitive psychology. Opening research includes a review of the current understanding and positioning of ideation sketching, the literature that covers the given subject, and validates these findings by an online survey, followed by interviews with twenty experienced professionals in the field of car and entertainment design. This research is intended primarily for students and creative practitioners of disciplines such as design or architecture; however, the content can likely be beneficial in a broader context despite the resources and examples typical for these disciplines. Last but not least, the work concludes with a critical evaluation of the research results, addresses the lack of shared understanding and terminology, and proposes a systematic approach to ideation sketching at the level of practical exercises and formal education.