The user/plastic part interface was sharply oriented to direct functionalities such as toughness, durability, cost and so on, but, more or less recently, new concepts have been devised concerning secondary or indirect objectives such as appealing marketing features, new safety concepts or more generally, interactions between the user or the environment and the plastic part or the system including plastic parts. Some examples concern the sense satisfaction, the best known aspect, or the use of the user's senses to achieve the targeted aims, the latest and the most promising way to enhance the capability and attractiveness of all the devices. An accomplished example is 'The Rinspeed Senso with zenMotion', a concept car that reacts to the mood of its driver.
The five senses generate impulse buys and influence considered purchases. Plastics are well suitable to create appealing products fulfilling the five senses requirements as illustrated by the Figure 'Plastics-Fulfil-The-Five-Senses'.