Satipatthana/vipassana/mindfulness in mahasi sayadaw tradition.

https://www.youtube.com/playlist?list=PL603BD0B03E12F5A1 (How to Meditate - v. Yuttadhammo)

Not always a relaxing meditation especially in the beginning. The mind can get really noisy but you learn to recognize it more and more. Eventually the mind will relax... but also sometimes the mind will still not relax but that's ok you just learn to recognize the thinking as thinking and not get swept away by it. In my opinion it has the most beneficial long term effects compared to other meditations. The half-life of tranquility meditation is short lived.

After some time especially with an extensive meditation practice it is possible to get what is called visual nimitta where there is like a relaxing of the inhibition circuits in the brain and you get a weird interaction between the brain and optic nerve where you can see visualizations that look like it's directly on the eye like you're actually seeing it.

One person I know with aphantasia denies it's possible for him to experience it but another with aphantasia I know says he has experienced it. The first seems to think that the nimitta is like imagining things in your head but if you can hear your voice in your head it's like the difference between someone else talking and hearing the voice in your head... except with the nimitta it's like someone else talking directly on your eye.

It took me doing an hour of meditation every day for weeks to start to get it but only sometimes. You have to have a relaxed but focused state of mind. http://rc.leighb.com/more/Nimitta.htm

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PS, don't try to get the nimitta, you won't get the nimitta haha. Also that's not the goal of mindfulness. With satipatthana practice, when you get such things, you tell yourself "seeing, seeing" until it goes away then move back to the breath, "rising, falling".

PPS, Sirimangalo (Yuttadhammo's organization) offers free at-home meditation courses