**8. Conclusions**

In this work, a multi-sensory sound-temperature cross-modal mapping method for conveying a total of 24 colors (six hues and four different color dimensions of dark, bright, warm and cold) was designed. The mapping was based on previous unisensory temperature-color and sound-color codes. They were adapted and tests were performed for finding out the best way to mix them for reaching a satisfactory multi-sensory cross-modal code. In addition, a semantic study of the musical sound cues and temperatures from those methods were acquired. The results showed that the musical sounds and temperatures can be used as a substitute for color hues and color dimensions. Additionally, the data from the results guided us into designing the optimum multi-sensory temperature-sound method based on those musical sounds and temperatures. We hope this work can encourage researchers to consider thermal and sound multi-sensory interaction both as a substitute for color and as a way to improve accessibility for the visually impaired people in visual artworks and color experience.

**Supplementary Materials:** The sound wav files on CLASSIC and VIVALDI sound color codes in Table 1 are available online at https://www.mdpi.com/article/10.3390/electronics10111336/s1.

**Author Contributions:** Conceptualization, J.-D.C.; methodology, J.-D.C.; software, G.C.; validation, J.-D.C. and G.C.; formal analysis, J.-D.C. and J.I.B.; investigation, J.-D.C., J.I.B. and G.C.; resources, J.-D.C.; data curation, G.C.; writing—original draft preparation, J.-D.C.; writing—review and editing, J.-D.C. and J.I.B.; supervision, J.-D.C.; project administration & funding acquisition, J.-D.C. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Science Technology and Humanity Converging Research Program of the National Research Foundation of Korea, gran<sup>t</sup> number 2018M3C1B6061353.

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Institutional Review Board of Sungkyunkwan University (protocol code: 2020-11-005-001, 22 February 2021).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Conflicts of Interest:** The author declares that they have no conflicts of interest.
