You might view a thumbtack as something that can only be used to hold the paper to a corkboard. 

Kim has studied ballet for a long time and enjoys dancing. She's currently taking tango classes. Despite the fact that the motions are quite different from the dances she is accustomed to, she has discovered a useful memory technique in connecting the new dance knowledge to her past dancing experiences and to her personal love of dancing. This strategy suggests reliance on - - - - -.