One of the more striking and worth­while group shows of recent months in the Denver area could be seen in May and June at The Gallery, which has established a reputation for the new and the provocative. Seven artists, all under forty, let the public have a look at a fairly large selection of their current work, some of which is highly original and disturbing in a good sense. The seven artists were Luis Eades, Roger Kotoske, Robert Mangold, Gene Matthews, Roland Reiss, Herman Sny­der and DeWain Valentine. (By what was probably an oversight, some can­vases of the admirable Spanish painter Tharrats