The Boston Circus Guild performed their “fire throwing spectacular” at the Somerville Arts Council’s “Ignite! A Global Street Food and Fire Festival” in Union Square last night, Aug. 15, 2015. (Photos copyright Greg Cook)

The Boston Circus Guild performed their “fire throwing spectacular” at the Somerville Arts Council’s “Ignite! A Global Street Food and Fire Festival” in Union Square last night, Aug. 15, 2015. (Photos copyright Greg Cook)