There a several key elements to helping you create an environment for your cat that produces a zen like vibe. The main one is finding a space that is quiet so the cat can relax in.
The next element is picking plants that are safe for cats to enjoy. Having plants create a vibrancy of colour and produce scents that often can be relaxing for a cat.
If you can build an outdoor catio this can be very beneficial to your cat. Natural light, outdoor elements and sounds and enhance a cats senses.
A uncluttered space can also helps cats become less stressed.
Using natural materials like wood can also produce a calming vibe for your cat.
Consider incorporating comfortable cushions that mould into a cats frame helping them sleep better.
Also mood lighting or lights designed to enhance a cats senses can be very helpful in calming a cat.
If you want to understand what plants are best to buy check out this article for more info.