You go with the intention of window shopping, enter a shop and casually pick up a shirt that you like. It is blue in color and a quick mental check confirms that you already have 4 blue shirts in your wardrobe. You decide to hang it back. And just then you notice another shopper eyeing that same blue shirt, waiting for you to leave it. You suddenly grab the shirt back and now you are somewhat more sure why you need to by it.
Suddenly the interest of the other person changed the way you perceived that shirt. How it helped you firm your decision. How easily you moved from possible action to definite reaction!
Perceptions are not static.
“The tickle is not in the feather”- Galileo