Rectangular aperture in blue bacterium with internal red filaments

A three-dimensional, oblong, blue form with a central rectangular cavity is depicted. Within this cavity, multiple red, strand-like elements are arranged circularly, graduating in size from largest at the top to smallest at the bottom. The blue form features several thin, elongated, pointed projections extending outward from the area surrounding the cavity. These projections appear to originate from the blue form's surface.