The collection of fine art at the White House has evolved and grown over time. The collection began with mostly presidential portraits, commissioned or purchased by Congress, or donated by presidential descendants. In the era before photography, some presidents invited painters to set up studios in the White House to record significant events and paint their likeness. In the late nineteenth century, a few landscape paintings were acquired for the White House, but not until the John F. Kennedy administration was the first curator hired and protocol developed for maintaining and adding to the collections. Since that time, it has grown exponentially under the guidance of a professional curatorial staff and now includes more than 500 works of art, selected for their historical and cultural significance.