A dynamic display device is disclosed, that is adapted to be removably attached to the front of a conventional monitor, such as a television monitor. The device intercepts the light emitted by the monitor to produce an abstract, moving display. An opaque grid structure forms a plurality of channels, including peripheral channels that are open along at least one side. A translucent panel wraps about the grid structure, and diffuses the light, displaying the diffused light on both the front and on the sides of the display device. An attachment mechanism, such as suction cups or a reusable adhesive, attaches the device to the monitor. The dynamic display device may be constructed as a unitary, inflatable structure having an internal grid and translucent sides and front.