TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The cage silsesquioxane compound is of formula ((RSiO(1.5))a) (2a). The silsesquioxanes comprise 7 cage silsesquioxane compounds e.g. cage silsesquioxane compound of formula (1Q) (preferred) and (2Q). The cage silsesquioxane compound comprises a cage silsesquioxane compound having at least three polymerizable groups and at least three non-polymerizable groups, where the compound is present in an amount of at least 10 mol% with respect to the total amount of the silsesquioxanes.R = polymerizable group or non-polymerizable group; anda = 8, 10, 12, 14 or 16.Provided that R groups may be the same or different.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: (I) further comprises a pore forming agent, which is at least one comprising polystyrene, polyalkylene oxide, polylactic acid, polycaprolactone, polycaprolactam, polyurethane, polyacrylate, polyacrylic acid, polymethacrylate, polymethacrylic acid, polyacetal or polyperoxide. Preferred Components: The polymer has a weight-average molecular weight of 10000-500000. The pore forming agent has a 50% weight loss temperature of 180-350 degrees C in thermogravimetric analysis under a nitrogen stream at a temperature elevation rate of 20 degrees C/minute. The pore forming agent has a polystyrene-equivalent number-average molecular weight of 100-50000. The film has a refractive index of up to 1.34. The film has a film density of 0.7-1.25 g/cm3. EXAMPLE - 1,3,5,7,9,11,13,15-Octaethenyl-pentacyclo(9.5.1.1(3,9).1(5,15).1(7,13))octasiloxane (5 g) was added to chlorobenzene (13.2 g). The resulting solution was heated to reflux at an internal temperature of 132 degrees C under a nitrogen stream and a solution (31 ml) containing V601 (RTM: Dimethyl 2,2-azobis(2-methylpropionate)) (0.2 g) (10-hour half-life temperature 66 degrees C) dissolved in chlorobenzene (80 g) was added dropwise over 310 minutes. After the dropwise addition, the mixture was further heated to reflux for 1 hour. The reaction solution was cooled to room temperature and to the reaction solution, electronic grade methanol (340 ml) and ion exchanged water (34 ml) were added. The precipitated solid was collected by filtration and washed with electronic grade methanol (10 ml). After the washing, the solid was dissolved in tetrahydrofuran (40 g) and ion exchanged water (8 g) was added dropwise with stirring. After the stirring for 1 hour, the supernatant was discarded by decantation and electronic grade methanol (20 g) was added. The precipitated solid was collected by filtration and dried to obtain a resin (1.9 g). The resin was dissolved in propylene glycol monomethyl ether acetate to prepare a solution having a solid concentration of 8 wt%.