Symbolism has often been confused with the Decadent movement. Arthur Symons, a British poet and literary critic contemporary with the movement, at one time considered Decadence in literature to be a parent category that included both Symbolism and Impressionism, as rebellions against realism. He defined this common, decadent thread as "an intense self-consciousness, a restless curiosity in research, an over-subtilizing refinement upon refinement, a spiritual and moral perversity". He referred to all such literature as "a new and beautiful and interesting disease". Later, however, he described the Decadent movement as an "interlude, half a mock interlude" that distracted critics from seeing and appreciating the larger and more important trend, which was the development of Symbolism.