Sometimes you have a long sequence of objects and you need only a little angle from one to another, like in a chain. To solve that issue, you can use many methods. The Formula Effector or just the Shader Effector can be effective. If the challenge for you is to have a huge amount of clones and they have to be randomized rotated but always in 90 degrees or something like that, you will find here the example from the manual discussed.