How does it feel?

Taking acid is described as 'a trip' because it can last as long as 8 to 12 hours from start to finish. Kicking in anywhere between 20 minutes and two hours after taking, the first signs are a sense of euphoria and expectation, along with a tingling body. Once you start to feel these effects, you'll be peaking within half an hour to 45 minutes. At this stage it's pretty common to feel a bit sick.
The actual peak lasts anywhere from two to five hours. A lame tab might make you feel relaxed, laughing, a bit like being stoned but with super hero vision; colours may seem brighter, patterns on the surface of things more eye-grabbing. Take a better tab, and you'll have rich visual hallucinations; colours will seem more vibrant, flat surfaces may ripple and shimmer. You may notice tiny details on objects. Music sounds better and louder. At the same time, you might feel blissed out, have flashes of insight into yourself or the world, feel yourself dissolving, or see objects merging into one another.
LSD works by diddling with, or completely removing the normal filters your mind creates between it and the outside world. With these filters down, more information comes in: You sense more, think more, and feel more. At higher doses, the rush becomes a flood, and your senses actually begin to merge until you can see sounds or smell colours. The experts (a bunch of very experienced 'travellers') have recognised four levels of trip. The strength of the tab is the biggest factor, but how relaxed and comfortable you are also plays a big part.
+One: Strong visual hallucinations. Bright colours stand out, objects appear to ripple or breathe. Coloured patterns behind the eyes are vivid, more active. Moments of reflection and distractive thought patterns. Thoughts and thinking become enhanced. Creative urges. Euphoria. Connection with others, empathy. Sense of time distorted or lost.
+Two: Very obvious visual effects. Curved or warped patterns. Familiar objects appear strange as surface details distract the eye. Imagination and 'mind's eye' images become vivid and three dimensional. Some confusion of the senses. Some awareness of background mental processes such as balance systems or auditory visual perception. Old memories becomes accessible. Images or experiences may rise up. Music is powerful and can affect your mood. Sense of time lost.
+Three: Very strong hallucinations such as objects morphing into other objects. Intense depersonalisation - the barriers between you and the universe begin to break down. You feel you have connection with everything around you. You can experience contradictory feelings simultaneously. Some loss of reality. Time meaningless. Senses blend into one. Feeling of being born. Multiple splitting of the ego. Powerful awareness of your own mental processes and senses. Highly symbolic visions when eyes are closed.
+Four: A very rare experience. Total loss of visual connection with reality. The senses cease to function in the normal way. Total loss of self. Merging with space, other objects, or the universe. The loss of reality becomes so severe that it defies explanation. Pure white light.