Create your own city skyline across your window. Any piece can be placed in any order. each piece is 150mm long with 100mm 50mm and 20mm bridges available to fill the gaps. as each piece is thin it can also be cut to make it fit the size of your window. any density can be used however it lookes best when you print it in black. blu-tac or double sided tape can be used to stick them to any window.