The silhouette of the bridge is a wave, with a principal arch 235 metres long, standing 60 metres above the water. The total span of four lanes is long, and also includes pedestrian walkways. The National Museum of Arts of the 21st Century (MAXXI for short), in Rome, was designed and built between 1998 and 2010. The main theme of its architecture is the sense of movement; Everything in the structure seems to be moving and flowing. Hadid took inspiration from the surrounding orthogonal site grids to determine the overall form. The facade belongs to her earlier period, with smooth curving white walls and an austere black and white colour scheme. The building is perched on groups of five very thin pylons, and one gallery with a glass face precariously overhangs the plaza in front of the museum, creating shade. Rowan Moore of "The Guardian" of London described its form as "bending oblong tubes, overlapping, intersecting and piling over each other. The imagery is of flow and movement and it resembles a demented piece of transport architecture. Inside, black steel stairs and bridges, their undersides glowing with white light, fly across a void. They take you off to the galleries, which are themselves works of frozen motion. The design is intended to generate what Hadid called "confluence, interference and turbulence",  In 2002 Hadid won an international competition for her first project in China. The Guangzhou Opera House is located in a new business district of the city, with a new 103-storey glass tower behind it. It covers 70,000 square metres and was built at cost of US$300 million. The complex comprises an 1,800-seat theatre, a multipurpose theatre, entry hall, and salon. A covered pathway with restaurants and shops separates the two main structures. This building, like several of her later buildings, was inspired by natural earth forms; the architect herself referred to it as the "two pebbles". It appears akin to two giant smooth-edged boulders faced with 75,000 panels of polished granite and glass. Edwin Heathcote, writing for the "Financial Times", noted Hadid's concentration on how her design could transform the urban landscape of Guangzhou, as the building rose as the centre of the new business area. He wrote in 2011 that Hadid "produced a building that seems to suck the surrounding landscape into a vortex of movement and swirling space... appears both as alien object in a landscape of incomprehensible vastness (and often overwhelming banality), and as an extrusion of the peculiar nature of this landscape."