The ground: an unavoidable, unforgiving medium in the art of breakdancing. It bruises and cuts a dancer’s hands. Experience forms callouses. So, when world-renowned breaker and San Jose native Raymond “NastyRay” Mora set out to photograph some of the world’s top breakdancers (B-boys), he focused on their hands. The resulting gallery goes on display Friday night in San Jose, and a corresponding breakdancing competition will take place Saturday at Edenvale Community Center.