Thousands of design fans flooded Cape Town's convention centre today to see the opening of the Design Indaba's second act; the Indaba Expo. More on that tomorrow. Meanwhile upstairs the all-star line up of speakers continued.

Leading the pack was Core's highlight of Day 3: Cameron Sinclair, the ever-visible founder of Architecture for Humanity. The blonde dynamo was punting his organization in his usual passionate way but he departed from the script to share an event that had inspired him as a boy.

In a church hall in an insular America in the early 80's a man spoke about fairness toward people in need around the world. Since no-one would speak to the man afterwards, the young Cameron sat down and chatted to him. Some time later Sinclair saw in a newspaper that the same man had won a Nobel peace prize. His name was Desmond Tutu.

Legendary stuff.