The 'unicorn' is the great prize of startups: a privately held company valued at more than one billion dollars. Building a unicorn doesn't just make fortunes, it makes legends.

But, like the name suggests, those remarkable stories of success are few and far between, and not without their share of risk.

David Shein founded perhaps Australia's first unicorn—Com Tech—and has gone on to become a venture capitalist, helping other companies find their own success.

In the Drawing Room, David shares the wisdom he's learnt from his years in business, and talks about his book, The Dumbest Guy at the Table.