![Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color whe… | Color palette design, Color, Colour wheel theory Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color whe… | Color palette design, Color, Colour wheel theory](https://i.pinimg.com/736x/35/bb/6e/35bb6ef7c02e430a842c8d89ebe7e8d9--colour-combinations-colour-schemes.jpg)
Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color whe… | Color palette design, Color, Colour wheel theory
![Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color wheel. They are harmonious. Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color wheel. They are harmonious.](https://i.pinimg.com/originals/35/bb/6e/35bb6ef7c02e430a842c8d89ebe7e8d9.jpg)
Tetradic colors-combinations of 4 colors that form a rectangle or square across from each other on the color wheel. They are harmonious.
![combinatorics - How many ways to colour a $4 \times 4$ grid using four colours subject to three constraints - Mathematics Stack Exchange combinatorics - How many ways to colour a $4 \times 4$ grid using four colours subject to three constraints - Mathematics Stack Exchange](https://i.stack.imgur.com/6Qdjf.png)