What is Idea, Concept and Theme

What you understand about idea, concept and theme?

IDEA :-
   What I understand about idea is, idea means what we think about something or suggestion it related with
    what we want to do. And also any things is come out from our mind as a result. With the idea we should
     plan it and the idea also should be creative and interesting. Idea about something what we imagine in our
    mind, such as we look at something like a chair, we get a new idea to develop the chair to make it look
    different, it should have a imagine from our mind and come out with the idea.

Figure 1 : Bulb is the icon for idea

CONCEPT :-
      What I understand about concept is, concept should come out with the idea first after we can decide
       what the concept we should do. Concept is a general idea and something like creation, innovation,
        design or invention. And concept also how we decide the design it related with our idea, for example,
        the color, pattern, design and so on.

THEME :-
      For my opinion about theme is, theme means like main subject in what we do, such as, in exhibition,
      installation art or movie. Theme is very important because without the theme we cant decide the
      what our next step in our project. Concept  also can be a style because with one theme we can explore
      the idea and concept in in our project.

Figure 2 : example of theme, floral theme