I've been looking for information about the author of this work, and I've found that it is the sculpture Game of Boys (Juego de Muchachos), by Elisa Seiquer. This artist was born in 1945 in Murcia, died in 1996. Shortly after beginning her studies at the School of Arts and Crafts, she went to Valencia and Madrid, to expand her knowledge. She received a scholarship to study in Paris. In 1972, she received the award in sculpture Francisco Salzillo.
Like most women in all spheres of society, she was not assessed, but today, her work is well recognized.
Here you can see some of her works. The sculpture of the image (early eighties) can be viewed in the garden of the 3 cups (garden of Isaac Peral), in the neighborhood of La Flota, Murcia.