There are many sorts of objects.

For example, the colour green is an object according to the above definition.

It is the purpose of science to trace the laws which govern the appearance of objects in the various events in which they are found to be situated.

For this purpose we can mainly concentrate on two types of objects, which I will call material physical objects and scientific objects.

A material physical object is an ordinary bit of matter, Cleopatra's Needle for example.