Term: optical illusion: an optical phenomenon that results in a false or deceptive visual impression
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: clock: a timepiece that shows the time of day
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: european toad: common toad of Europe
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: furcation: the place where something divides into branches
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: seseli: a rosid dicot genus that includes moon carrots
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: french marigold: strong-scented bushy annual with orange or yellow flower heads marked with red; Mexico and Guatemala
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: volcano: a mountain formed by volcanic material
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: rain: drops of fresh water that fall as precipitation from clouds
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: enthusiasm: a lively interest
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: swan river everlasting: Australian annual everlasting having light pink nodding flower heads; sometimes placed in genus Helipterum
Broader: physical phenomenon: a natural phenomenon involving the physical properties of matter and energy | Unrelated: soft-shell clam: an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe