Summer blockbusters are very expensive to make. They have things that have to be expensive such as 600 effects shots or CG characters that have to go a certain way or a film design that is different but expensive.
To design is to communicate clearly by whatever means you can control or master.
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When I design and wonder what the point is I think of someone having a bad time in their life. Maybe they are sad and they wake up and put on something I have made and it makes them feel just a bit better. So in that sense fashion is a little help in the life of a person. But only a little.