STORY: Having opened the 70th edition of the Venice Film Festival, Hollywood actress Sandra Bullock was able to take stock and reflect on her latest role as Dr Ryan Stone in Mexican director Alfonso Cuaron's 3D space movie 'Gravity', which saw her team up with long-time friend, George Clooney,

She said her performance, which required that she spend time in an LED-lighted box that was manipulated to achieve the film's stunning special effects, had been demanding physically and mentally.

"There was no walk in the park, but it wasn't a walk in the park for anyone involved, especially Alfonso. I mean the immense pressure that he was under, technicians were under, no one knew if this would work until the day I got into the first set-up the first contraption," she said.