Attractive things work better

That’s right. People prefer beautiful things. Clean, simple, pretty
things. It even goes so far, that we are more tolerant about a
product’s flaws (functional wise) when it’s aesthetically pleasing.
Just think about the iPhone.
 
The aesthetics of a product influences how we sense it. Or, to
rephrase it, how we feel about something (emotion) is tightly coupled
with how we perceive it (cognition). To find out more, check the
slides
and read the article by Stephen Anderson.