AMHERST - Are the images that now cover the walls outside Hampden Gallery at the University of Massachusetts campus obscene, thought-provoking, crude or ingenious? Some people cannot get past the naked forms in various acts of sex and violence. For others, the drawings in black marker by Austrian artist Heimo Wallner tell a story of society, filled with everything from violence, love, weapons and fame to pop music, torture, virtue and drugs. And for some, it's hard to understand or process the hundreds of figures and their actions.