Mind refreshing comes into picture, when one gets tired, by heavy work: maybe physical or mental. Whatever is needed, is that ,the mind, must go, to original silent and tranquil state.
Some useful ways are suggested here:
* Be maximum with Nature!
** Have a break in the routine work schedule!!
***Get engaged in the act/process which you like be most to do!
Use of Eyes and Ears, either single or combined, gives the most powerful refreshing Efect!