Adding light to design is transformational it can alter mood and bring about fresh perspectives. The current sunny weather is testament to how a little light and sunshine can alter moods and make us all more cheerful. The Next Web champion of developing technology, has a great article on how website design can affect mood, Thinking about your 'viewers' feel when they see your work really helps and this can be applied to learning and teaching as much as it does to designing media. What sort of learning journey do we want to provide, a happy journey that stretches knowledge or an uncomfortable trial that leaves the student unhappy and scared they'll never get it. Taking time to see how you feel about work is a good idea. Adding engaging, light, colourful designs that are easy to use can help make a memorable enjoyable experience and who doesn't want to enable that.