A lot of that stuff is always there - just think of the hundreds of optical illusions that can be constructed! - but until it&#x27;s connected with an emotional experience during a trip, the brain doesn&#x27;t single it out.<p>The effect that jumped out at me was focusing at a spot on the floor while standing up and turning.  It creates the momentary impression of a spiral pattern in my perception.  Especially with a dot-like pattern on the floor  :)<p>Also, if you like rainbow halos, you might also like Shock Diamonds:
<a href="https:&#x2F;&#x2F;www.google.com&#x2F;search?q=shock+diamonds&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwj4r5b2l47LAhXBFh4KHTq3D-gQ_AUICCgC" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;search?q=shock+diamonds&amp;source=lnms&amp;t...</a>