Balls Of Light: What are these unknown objects seen flying over crop circles?

The footage shown in Pierre Beake's presentation above is some of the best I've seen, it shows 3 different objects on film at once.

Renowned crop circle photographer Steve Alexander's footage of a ball of light is also compelling.

There is also of course the famous 1996 Oliver Castle video showing the supposed creation of a crop circle by the balls of light. The jury has been out for years as to the authenticity of this video so take it with a grain of salt.

So what do you think these are? Solid metallic spheres? Or are they somehow made of pure light as some have reported?