Note: This is a review by sound researcher Jeph Lo of "Exchanged Tokens of Youth", performed by Yung-Hung Wang, You-Sheng Zhang, & Cvo Yang in Music Can Shape Music Week held at the end of 2015 at Guling Street Avant-garde Theatre. With the physical presence of sounding objects, Lo re-thinks John Cage’s idea on the quality of sound being free and invisible in the (performative) space, and further mentions a possibility for re-negotiation between artists’ “physical presence” and objects, which is worthwhile for us to ponder on.