Catalonians show their pride and their wish for independence from Spain by hanging the Catalonian flag from their balconies. There are 4 types of Catalonian flags: red and yellow stripes, red/yellow stipes with yellow triangle & white star, red/yellow stipes with blue triangle & white star, and a mixture of the latter 2.
This version with the blue star indicates that this person believes in complete separation from Spain. The others believe in it as well, but have different ideas of how to get there.