At Şişhane almost all of the shutters of shops are covered in graffiti. You can easily recognise famous German graffiti artist Kripoe's yellow hands. Once you see one of them, you'll see that they are everywhere. At the cross section of Balkon Street there is one of the three Space Invaders mosaics by invader, from 2003. It's definitely a must see.
Walking down from the Yüksek Kaldırım St we'll reach the seaside; Karaköy. It has been Istanbul's all time favourite musical instrument shop district. Apart from the hundreds of colorful graffiti, vintage shops and the music coming from the stores makes Karakoy a really cool place.