This year’s summer pavilion of the Serpentine Gallery has just opened to the public, to little surprise with respect to the computer rendering that was presented a few months ago by its author, the Burkina Faso-born Berlin-based architect Diébédo Francis Kéré. It is a wooden pergola that seems to float over the floor, stretching – in a metaphorical allusion to tree tops – above a fence of indigo pieces that delimits a space of friendly scale. Its simplicity and its sense of civic purpose strike a contrast with the frivolous sophistication that tends to characterize the Serpentine’s yearly installations in London’s Hyde Park.