Earth referred to as "moons", after Earth's. The gravitational attraction between Earth and the Moon causes tides on Earth. The same effect on the Moon has led to its tidal locking: its rotation period is the same as the time it takes to orbit Earth. As a result, it always presents the same face to the planet. As the Moon orbits Earth, different parts of its face are illuminated by the Sun, leading to the lunar phases; the dark part of the face is separated from the light part by the solar terminator. Due to their tidal interaction, the Moon recedes
Wall of the Sun and Wall of the Moon "Moon". The two mosaic murals were assembled "in situ" by a team of technicians under the direct supervision of Miró and Llorens Artigas. The works were inaugurated in 1958, as same as the building, and received rave reviews. Even one of the murals, the "Wall of the Sun" won the Biennial Prize of Guggenheim Foundation. Miró later return to work for UNESCO, designing the UNESCO Medal for Pablo Picasso. Initially, the walls were outdoors, but later moved inside the building to protect them from damage caused by acid rain. Wall of the Sun and Wall of the Moon The Wall