[gohrt]

A rainbow is curved. The Pride flag is not.

[dragonwriter]

> A rainbow is curved.

More specifically, its a circle. Though usually you can;t see the whole thing.

> The Pride flag is not.

The pride flag is a section of a rainbow of infinite radius.

[drakeandrews]

Alternatively, a pride flag is an orthographic representation of a rainbow whose curve is in the direction perpendicular to the viewing plane.