On: Preventing users from pouring water into coffee ma...

[_pctq]

I have a saeco odea, they designed the bean recipient so it looks more like a curved plate than a bottle : http://imgur.com/CJzJLQ3 .

I think it's quite obvious to the user you don't put water in this.

On the other side, the water tank is a bit hidden, being inside the machine, behind an opaque face. Making it transparent would probably help.