Last time I stopped smoking cannabis I got these for a couple days. They are intense. The most recent was kind of like taking a slow rollercoaster ride through three black hole sized perfect spheres orbiting nothing. Another one was less geometric but was basically me getting sucked into a black hole. Both had this almost lucid dreaming feel where my entire sense of self became condensed into a single point... but I was still there, aware of what was happening... it was incredibly memorable.