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Bell, a creative man with a sensitive nature and talent for the arts, produced his first invention at the age of 12. He invented a machine for dehusking wheat, normally a laborious process. He was later, and most well known, for inventing the telephone.
I wonder what he would think about how his invention has evolved over the years. When you couple this with the quote from the Chairman of IBM a few weeks ago, I think both men would be amazed at the Smart Phone which combines the computer with the telephone.
It seems to me that Bell's quote is quite clear. We miss opportunities by focusing on the past rather than looking ahead. The closed door is the past. We can't change that. The open door represents future opportunities. When the door opens, step inside.