I was a circle in a room full of squares so I became a square

The square's all decided to be circles so I became a circle again

They told me I wasn't a "proper" circle

I wasn't doing the circle thing right

Then I moved into the light to find that they were all triangles

They thought that they were circles but they were blind

I was a circle in a room full of squares who did not think that I belonged there

Yet I was the only one who could see my true reflection