balcony building curiosity house illusion odessa optical illusion sight sightseeing tourism tourist town ukraine wall architecture artwork birds cladding colorful colourful decoration decorative design facade front mock modern painted perspective roof visual illusion windows brick bricks slide fastener zip zip fastener zipper mural abstract background color colored colors colour coloured colours cube cubes desktop multicolored multicoloured squares structure structures texture textures boy kid phantasy play bars cattle farm grid lines patterns gradient movement blocks frame graphic illustration light warp dream optical shape vision distorted eight illusions sphere