architecture barcelona color colors colour colours floor guell Spain tiles tiling wall gaudi abstract appearance background brown coloration colored colorful coloring coloured colourful colouring cream creased creases decorative depth design details floor-tiling interconnected interlinked light linear lined lines mosaic multi-colored Multi-Coloured patterned patterns perspectives pieces shape shaped shapes small style surface surfaces surfacing texture textured textures vibrant wallpaper bright checkered horizontal interwoven matrix row rows square squared squares vertical purple purple-centred