Cat owners

One of my cats does this. A firm 'no' will stop her if I am watching, but she does it at other times. She likes the top of the wardrobes and dusts them for me , also clumsily climbs the dresser shelves like a ladder. One day she will break one of my legs when she launches herself off the wardrobe onto the bed at night. I don't think there is a lot you can do except keep your ornaments away.
My other cat is such a lazy old porker that he can only just manage to reach the sofa!

Cherrytree I could start a new trend in interior decor

I'd remove the ornaments too

Wondered if distraction might work. We have a cat tree and they fight about who will sleep on the highest bed. OR

We have a three tunnel toy they love to play and sleep in www.amazon.co.uk/d/Cats/Ancol-703300-Acticat-Play-Tunnel/B00427D3PQ/ref=sr_1_1?s=pet-supplies&ie=UTF8&qid=1495288494&sr=1-1&keywords=ancol;&tag=gransnetforum-21

OR I have heard cats can be trained by clickers - I doubt somehow that it works with cats !
www.bluecross.org.uk/pet-advice/clicker-training-your-pet

Two of our current crop of feline house mates like nothing better than a snooze on the top of our kitchen cupboards. Fine by us though it can take you by surprise when they jump down and you hadn't realised they were there. Young Harry also does a daily inspection of the conservatory roof, mostly to check out if the neighbouring cats are about. I know what you mean, the look on their face when they realise the roof is either wet or icy, but so far he has managed a controlled landing via the water butt. I think it is just how Bertie is, likes to check out all his territory. I would move the ornaments nina.

Spikes on your mantelpiece and wall unit

We have inherited my late father's Norwegian forest cats.
They are not allowed in the sitting room as they will literally swing from the chandelier given half a chance.
To them curtains, units, mantelpieces are a pussy cat playground!

PS we don't really have a chandelier

No ,there is nothing you can do, as you say it is a natural behaviour . I would move the ornaments .

Not got a clue, nina. We have beams in the roof of our 'playroom' and one morning woke up to find 2 cats (mum and son) perched up there surveying their Kingdom.