Non-functional Elements: auditory, visual, tactile, olfactory, and taste

Human emotion is related to the non-functional elements. Living beings including human beings are subject to various emotional experiences. Emotion is a fascinating experience that all the living beings experience through agony and ecstasy. Emotion relates to humour, agitation, romance, sadness, etc. Emotional experiences create a bond between two entities. It is perhaps the most challenging area to understand, analyze. It is almost impossible to generalize a product globally as per human emotion and its effect. Directly or indirectly it is related to socio-cultural conditions. Nature also plays effective role in human mind and body. Seasonal changes, day or night conditions evoking and inspiring human being from the very early human history.

Cognition (perception) and emotion are closely related. It is perhaps the most common human experience that man learns from the infant stage. Recognizing form, color, shape, texture, etc are part of human experiences. Human being relates to sounds before even recognizing any form or shape. Smell and auditory senses are the most important organs that human being is associated from the early stage to use for their protection and safety. The sound of footstep in dark signals warning for taking defence while burning smell warns of danger.