I would be lying if I said that this is not an assault on the senses because that is exactly what Gaspar Noé accomplishes as he depicts a celebration which is as unrestrained as it is harrowing. It is a celebration that you may find yourself unprepared for, especially if you're new to the work of Noé as he leaves very little to the imagination. He ensures that you are trapped inside the abandoned school with the dance troupe as their paranoia towards one another intensifies. It's a feeling that you can't shake as doing so would take you out of their reality which encompasses qualities such as exuberance, relationships, violence, desperation, self-mutilation, fear, and the human psyche. Those are all observable due to the cause and effect of the situation as the troupe never anticipates to succumb to the effects of LSD. They are in the midst of a whirlwind that is as intense as their rehearsal, and for that reason, it's not obvious as to when or how it will end, so finding out for yourself results in some shocking moments that are accentuated by the free-flowing cinematography. The closer that Noé gets to the uncomfortable situations, the more rampant they become, which illustrates a kind of depravity that is both frank and vile. It's an amalgamation that due to its visceral nature, you won't forget it anytime soon.
Whether the troupe is dancing or acting on exhibiting distrust towards one another, Noé is exploring what it means to have a pulse. That is a subtly that is of note because it is as rhythmic as the music which the troupe is familiar with, so it can be said that they are most alive when they are dancing as that is what brings about ecstasy for them. It's an escape from the outside world, but that does mean that they are immune to its influence, which is what Noé conveys as the troupe is in a state of disarray. That is a state that although it is connected to having a pulse, it results in acting impulsively since it is an attempt to curb the chaos. However, the question is raised as to whether or not the troupe is too far gone because they do not take time to consider the effects that their acts of violence have on one another. It's a downward spiral that serves as a contrast to the vibrant state of motion that is conveyed in the dance scenes, so the opposite ends of the spectrum never stray from their asymmetry.
You may find that some things will go over your head while watching this, but that is what will encourage you to fill in the gaps. That will help you appreciate what Noé is accomplishing even if you don't completely understand the method to his madness. I'm sure that is part of what will warrant rewatching this.