"Tower of Winds" (1986) and "Egg of Winds" (1991) are interactive landmarks in public spaces, resulting from a creative interpretation of contemporary technical possibilities. Whilst their function is in fact exhaust air outlets for the underground system below, their significance lies in Ito's treatment of their opacity, one of the hallmarks of his work. Whilst appearing solid during the day, the perforated aluminium structures "dissolve" at night through the use of computer-controlled light systems which form an interactive display representing measured data such as noise levels in their surrounding vicinity.