“We assume certain perceptions, certain concepts and certain boundaries”, explains Edward de Bono, who coined the term in 1967. “Lateral thinking is concerned not with playing with the existing pieces but with seeking to change those very pieces.” It’s the art of reframing questions, attacking problems sideways. They way a computer hacker or, say, MacGyver would think.

Breakthroughs, by very definition, only occur when assumptions are broken. In creative fields, this often happens when people break rules that aren’t actually rules at all, but rather simply conventions. Pablo Picasso changed art forever by smashing the “rules” of perspective, color, proportion. His Cubism took hold in Paris faster than Van Gogh’s impressionism—and any other new form, for that matter. Apple turned the tech world on its head by radically simplifying music and mice when everyone else equated more buttons and more megabytes and more jargon with better. When we look at great inventions and solutions to problems throughout history—the kinds that make what came before instantly obsolete - we see this pattern again and again.

http://99u.com/articles/31987/how-to-apply-lateral-thinking-to-your-creative-work