*2.5. Temperature-Color Cross-Modality*

Regarding cross-modality between temperature and color, works like [5,20] showed that there is a color-temperature association with the color warm–cold spectrum. In [20], the authors designed and performed a method for conveying color information both through thermal intensity and thermal change rate. The method was tested with ten users and showed successful results. In [5], a method for discerning up to 50 colors by feeling three different temperatures was designed. It included extensive interviews and user tests with visually impaired users. Both works proved that temperature cues as a way of expressing color can be a successful interaction method and that visually impaired users can differentiate temperatures quite comfortably as long as there is, at least, a difference of 3 ◦C between them. This fact will be applied in our multi-sensory method for expressing colors.
