Some collect fine antiques or valuable works of art, while others amass extensive and exquisite collections of seashells, butterflies or leaves. However, there are also many Fairest who collect kitschy decorative figurines, dolls, or even beer cans. Such collections serve as touchstones to the physical reality of the mortal world as well as a chance to display their perfect collection and their expertise to others.
touchstone вроде переводится как критерий. Но как коллекция может служить критерием физической реальности? Может, имеется в виду точка соприкосновения?