The view of diffusing colors, which create a majestic bow on the sky after rain has amazed people and inspired their imagination for centuries. The rainbow has a significant place in religions and mythologies of the world and it has become a popular subject of painting, literary and music pieces of art. This amazing optical phenomenon has also become the symbol of peace, freedom and tolerance. The shades of particular colors that change gradually – from warm to the cold ones – have some aesthetic value and for that reason they are commonly used as a decorative motif.
