https://sites.google.com/site/chs4o8pt/meditation-1#meditation_serenity

This type of meditation creates a feedback loop causing the brain to release endorphins, serotonin and dopamine.

It is like a drug trip, not a psychedelic trip, but it's not normal meditation. Every breath you take is like a hit from a bong, but there's no bong. And it is hugely spiritual. It doesn't require super intense concentration so I think most people could learn to do it. I had to stop the other day because it was so intense I was getting nervous. How many people do you know who were feeling so happy, and connected to all things and feeling such intense metta that they were worried they might never get back to normal? And I felt the presence of non-physical entities too.

It also creates a kind of synesthesia where everything I see and hear I also feel in my body as if they are part of me. There is an effect like the brain is a virtual reality machine and what I see is really a movie inside my head, like my mind contains the whole universe including me walking around inside it. It changes the "energy" of your surroundings too. You could go to the filthiest shack in the poorest slum in the most miserable God forsaken corner of nowhere and meditating this way would make it a place of beauty and joy. These effects are not gross like a psychedelic trip they are subtle like a change in understanding... But I am still looking for the screen behind the movie.

The best thing about this type of meditation is not the intense experiences, the best thing is that between meditation sessions I'm happier and I worry less.

It's 100% free. And as far as I know it's legal everywhere.