No trecho do segundo parágrafo – Colour perception is an ide...

You use because with a reason clause when you are explaining a statement.

I couldn't see Elena's expression, because her head was turned.

Because it's an area of outstanding natural beauty, you can't build on it.

Be Careful!
When you use because at the beginning of a sentence, don't put a phrase such as 'that is why' at the beginning of the second clause. Don't say, for example, 'Because you have been very ill, that is why you will understand how I feel'. You simply say 'Because you have been very ill, you will understand how I feel'.