MG+Splash+with+their+hidden+wings

//**"Splash their hidden wings..."-**// I think that the writer is referring people who have lived in the shadows (as we see in line 10) but are no longer there. They "splash their hidden wings" meaning that they leave the shadows, they discover something, or they just start doing something different. The writer describes this moment throughout the entire poem. The moment someone emerges from the darkness. He says it is a blessing, weeds of warm light, and where the birds are (song birds I'm guessing), a veritable heaven on earth.