In this paper I try to show two shortcomings of interpreting necessity in Plato's Timaeus as aimless causal relationship. First, everything in Timaeus' universe is teleological from the very beginning - there is no undirected ""mechanism"" directed as it were from the outside.
Second, the concept of indeterminateness which is connected to necessity has to be interpreted in terms of difference between model and its image and not in terms of teleology and causality.