I love a refracted rainbow.  Whether it's an accident or on purpose they will always make me stop and zone out.  This is a 4" window decal (you can move it after you stick it) that looks like a sky blue Calder spiral when you first see it but when you hang it in a window that gets a bit of sun it'll create a rainbow effect that is mesmerizing.  

4" plastic moveable window decal 

1 sticker per order