balcony building curiosity house illusion odessa optical illusion sight sightseeing tourism tourist town ukraine wall abstract dream optical shape texture vision background colour distorted eight graphic grid illusions sphere 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 circle ripples ba1969 curve lines paper pattern rotation spin turn twirl mural color colored colors coloured colours cube cubes desktop multicolored multicoloured squares structure structures textures block buildings canada city corner glass office reflection skyscraper urban vancouver delusion icon inner needle oval pictogram shiny sign symbol wheel