A lamp is provided and includes: a light-emitting flexible lamp sheet; a movable rod on a first side of the flexible lamp sheet and having a first end connected to a middle part of the flexible lamp sheet; and a plurality of support rods on the first side of the flexible lamp sheet, each of the plurality of support rods having a first end connected to an edge of the flexible lamp sheet, wherein the movable rod and the plurality of support rods are configured to perform relative motion substantially along an extension direction of the movable rod to change a shape of the flexible lamp sheet.