Contradiction Dance is an oasis where the conventions of humdrum vocal speak are replaced by the language of movement. Dancers who have neither the space nor privacy to conduct their own metrical marauding at home can indulge in a series of drop-in classes for adults held in sessions. All five classes must be used within the span of a single session, and the present session runs until June 12 with scheduled classes Mondays through Saturdays. Join in on the heart-pumping workout of a Wednesday Jazz Basics class from 6 p.m. to 7 p.m., or try out '80s Hip-Hop Aerobics from 12:30 p.m. to 1:30 p.m. on Saturday. Diverse courses extend to contemporary dance, ballroom waltzing, poi spinning, tai chi, kung fu, and the vigorous calm of Thursday night's Yoga Groove class beginning April 8.