Art Gallery 21 presents “A Collection of Collage,” curated by Janet Gold and featuring the collage art of some of her friends, including Mimi Botscheller, Twiggy Boyer, Deborah Gregg, Bruce Helander, Andrea Huffman, Lynne Kroll, Carol Moore, Nance Nadel, Ann Schwartz, Janet Schwartz, Betty Usdan Zwickler and 6Hands Collaborative. This exhibition is presented to celebrate…