Done my fair share of ketamine over the years and for those who haven't, here's my honest view.
It is genuinely mind-bending. Treat it with the utmost respect.
Depending entirely on your frame of mind, it can be an intensely beautiful and euphoric hallucinogenic experience or it can be extremely frightening. Sometimes it's both in the same night.
On my last big ket trip things became very weird, very quickly. I was not in control of my thoughts or my senses and just had to ride it. The most incredible geometric patterns developed, pulsated and rotated before my eyes. I had extremely deep trains of thought and engaged in what felt like very profound conversations. It was all druggy nonsense, but I felt like I'd been repeatedly hit by lightning bolts of inspiration. I was able to recall early childhood memories in vivid detail. By 8:30am the next morning I was convinced we'd left my friend's flat and had been sat in a cafe for two weeks. So much so that I tried to pay his girlfriend the tab and became agitated when she explained that my money was no good there.