'duif', Dutch for pigeon, is a collection of 79 malformed pigeons against an abstract backdrop. Pigeons were the inspiration for this collection and these 'flying rats' tend to have a few 'variations'.

This project uses black png mask layers to generate the different duiven.

Each bird has descriptive but semi-generalized features to allow rarity ranking.
e.g.
Background: Noisy Double Quadrilateral.
Body: A Black Outline with a Yellow Body and Black Feathers.
Beak: A Yellow Beak.
Eyes: White Eyes with a Black Outline.

Variable features are:
- The color of its outline, body, feathers, (broken) beak, bloodshot/possessed eyes, glasses.
- The presence of feather, nostrils, broken beak, bloodshot/possessed eyes, glasses.
- Bloodshot in 'possessed' eyes (very rare).

Colors are:
- Default or random.
- Vertical, horizontal or concentric rainbow pattern.
- Noisy.

Backdrops are:
- Noisy or not.
- Random color.
- A Circle, a single or double quadrilateral with random colors.

's' to save the bird.