How long can you keep a secret? The Tantric Buddhists of Nepal and Tibet kept one of their arts a secret from the world until 1988, and they'll be sharing it soon with Triangle residents. From Feb. 28-March 21, two Buddhist monks in robes of gold and crimson (pictured) will create a mandala--a religious artwork made of millions of grains of colored sand--at UNC-Chapel Hill's Ackland Art Museum. Tantric Buddhists believe the ancient art of the mandala inspires feelings of peace and well-being. The two visiting monks, who speak some English, will attend a free public opening reception for Buddhist Art and Ritual from Nepal and Tibet
, an exhibit of sculptures, paintings and sacred objects opening Feb. 25 at the Ackland. The mandala will be on display through June 8. Call 962-5736 for details.