||The Timaeus, written at some point in the first half of the 4th century BC, is one of Plato's philosophical masterpieces. The first part of the dialogue features one of the speakers, Critias, giving a speech outlining an ancient conflict between Athens and Atlantis, in which Athens apparently resembles the ideal state from the Republic, although there are some differences that scholars investigate. The rest of the dialogue is a speech by Timaeus concerning a vast array of topics that can be roughly grouped under the heading of natural philosophy, including the creation of the world, time, planets, the human body, the nature of health and disease, the structure of and relationships between earth, fire, water, and air, and much more. Much of what is discussed is metaphysical, such as the creation of the soul, space, and the Forms. Timaeus' speech is said to at different times to be a likely story (muthos) and a likely account (logos), and its status as such has made interpreting its claims difficult for scholars for centuries.