How do they photograph things to make them look bigger?

The only way that we can judge the size of an object in a photograph is to compare it to other objects in the same photograph. Therefore, you can combine two or more photographs, with different enlargements, to create the illusion that some object is larger than it really is. Or you can build small models that look like something bigger than they really are. Or you can use tricks of perspective to make something look closer than it really is.