Poetry

This is a riddle poem. What is it? Can you solve the riddle?

=My skin shimmers with all the colours of a rainbow, and you hold me like a feather,  so gently, afraid to smear my shine with  your fingertips, reading me closely, spinning  me in your mind, gently placing me  in the black box where I whirr  contentedly, singing with my silver tongue.= =Charles Hadfield=