I have a species of tree that according to the mood and atmosphere around it changes colour or i guess species for example oak tree into cherry blossom , birch tree etc reflecting on the weather , your mood , internal thoughts , fear if you are being chased by someone who wants to kill you or if you are content on a leisurely stroll . So imagine you are on top of a high cliff or mountain and you look down and see a huge forest green neutral forest but the sky darkens and a rain cloud passes over and you see the leaves of the huge forest turn grey . These trees are often used in trials for crimes in my world as due to the trees abilities it can visibly show if someone is guilty or innocent when responding to questions .