Gabrielle Desmarais / Molly Gabbard / Rebecca Vigers / Uhuru / Manuela Jimenez
The word "protuberance" perturbs me. Nevertheless, here's a protuberance edition of Five in a Flash, inspired by this ring with sticking-out sticks. Ring above by Montreal's Gabrielle Desmarais (I like her gallery of art pieces that are all about balancing shapes).
"Tied" ring in soapstone and fox hair by Indiana's Molly Gabbard.
"Sword" ring by UK jeweller Rebecca Vigers.
"Milo" bar ring from Brooklyn furniture designers Uhuru.
Silver "lace" ring by Colombia's Manuela Jimenez.