of perennials, bulbs, grasses, shrubs and trees. It is the featured nature component of the world's largest green roof. The garden cost $13.2 million and has a $10 million financial endowment for maintenance and upkeep. It was named after philanthropist Ann Lurie, who donated the $10 million endowment. The garden is a tribute to the city, whose motto is "Urbs in Horto", Latin for "City in a Garden". The Lurie Garden is composed of two "plates". The dark plate depicts Chicago's history by presenting shade-loving plants, and has a combination of trees that will provide a shade canopy for these plants when they fill in. The light plate, which has no trees, represents the city's future with sun-loving perennials that thrive in heat and light. McCormick Tribune Plaza & Ice Rink and Park Grill The McCormick Tribune Plaza & Ice Rink is a multipurpose venue located along the western edge of Millennium Park opposite the streetwall of the Historic Michigan Boulevard District. On December 20, 2001, it became the first attraction in Millennium Park to open, a few weeks ahead of the Millennium Park underground parking garage. The $3.2 million plaza was funded by a donation from the McCormick Tribune Foundation. For four months a year, it operates as McCormick Tribune Ice Rink, a free public outdoor ice skating rink. It is generally open for skating from mid-November until mid-March and hosts over 100,000 skaters annually. It is known as one of Chicago's better outdoor people watching locations during the winter months. The rink is operated by the Chicago Department of Cultural Affairs rather than the Chicago Park District, which operates most major public ice skating rinks in Chicago. For the rest of the year, it serves as The Plaza at Park Grill or Park Grill Plaza, Chicago's largest al fresco dining facility. The 150-seat outdoor restaurant offers scenic views of the park, and hosts various culinary events and musical performances during its months of operation. From June 21 to September 15, 2002, the plaza served as an open-air exhibition space and hosted the inaugural exhibit in Millennium Park, Exelon Presents Earth From Above by Yann Arthus-Bertrand, a French aerial photographer. The Park Grill Plaza is affiliated with the 300-seat indoor Park Grill restaurant, located beneath the Grainger Plaza and Cloud Gate. The Park Grill is the only full-service restaurant in Millennium Park and opened on November 24, 2003. It