Basketballs are flying everywhere you look as multiple 3-on-3 games are taking place on the courts at Somerville’s Trum Field. The players pay no mind to the sun beating down on them on this particularly hot June day. Beyond the unofficial soundtrack of any basketball game– the sound of sneakers being squeaked across the asphalt and encouraging shouts from the crowd— is the rapid-fire sound of camera shutters opening and closing without hesitation.