Time, structure, patterns. These are some of the principles that guide the 9th edition of (S8) Mostra Internacional de Cinema Periférico that, under the title Lux Algebra, invoke the alchemical film elements that manipulate time and its structures, in order to define a program that complete the trilogy dedicated to film creation the Mostra has been developing in these past editions, from the light with The New Impressionists (2016) to the material that supports the images with Objects and Appearances (2017), on the concepts of appropriation of found footage.