With new technology it just might be possible to dream that dream, and even control the action as a dream master.

"You think of a purple cow, you turn a corner, and there's a purple cow," dream expert Thomas Piesel explained.

As CBS2's Kristine Johnson reported, Piesel uses a new type of sleep mask to conjure imagery in his dreams.

"Anything we can imagine we experience directly," he said.

It uses a programmable light pattern designed to turn on when you're in a semi-wakeful state to control what you see and do in your dreams. It's called 'lucid dreaming.'

"You can walk through walls, you can even talk to the dream itself," he said.