One of the most popular exhibition this spring is the Museum of Modern Art's "Rain Room." The line outside the exhibit hall has always been long since the art installation opened, and visitors wait for hours even in the rain to get in. The British design studio, Random International built Rain Room last year. It is part of the MoMA PS1 exhibition EXPO 1: New York, and is being exhibited in the lot directly adjacent to The Museum of Modern Art in midtown Manhattan. The installation is basically a field of falling water like rain that pauses wherever a human body is detected by three-dimensional cameras that feed information to the controls in real time. The rain room has a high ceiling, nearly 1,000 square feet, equipped with nozzles that pour down artificial rain. The interactive installation allows visitors to experience controlling the rain. Rain Room is open daily during regular Museum hours. The entrance to Rain Room is on West 54 Street, between Fifth and Sixth avenues. Same-day MoMA admission, EXPO 1admission, or a MoMA membership card is required for entry. AnEXPO 1 admission ticket may be applied toward the price of a Museum admission ticket or MoMA Membership through July 28. MoMA members and their guests enjoy priority access to Rain Room at all times, as well as an exclusive early member viewing hour, from 9:30 to 10:30 a.m. daily throughout the run of the installation.