Saying it's ineffable is being accurate. The human language is clumsy, and I'd argue our normal consciousness and ego lack the mechanisms to convey this experience in any tangible way to a person who hasn't also been affected by it.
LSD is quite possibly the most powerful thing I've ever experienced. It really is like describing color to a blind person.
You're going to be frustrated if you try to understand it without actually trying it. I just wouldn't recommend it for anyone who doesn't respect it appropriately.
I think any novel experience is impossible to explain to someone who hasn't "been there."
That said—it's interesting to consider, what can we say to each other, we who have plenty of experience with LSD?
Hello. I hope your life is cool, and I bet it is!
Right now I'm on a bench in a park near Riga's old town. It's one of the first days of real nice spring.
Life is strange, earth is strange, grass is strange...
Being on a planet in the middle of space is strange...
Enjoying this field of vision with colors and textures and light and dark is strange...
For me, the LSD experience is a vantage point. Like climbing up on a secret roof and looking at everything... really, everything... thoughts, language, logic, structure, emotion, time, space, mass, energy, love, yearning, fear, history, the future, ambition, alienation, loneliness, fruits, bread, wine, smoke, oceans, rivers, stars, computers, electricity, flowers, religions, poems, books, families, stories, superstitions, science, math, soil, worms, ... yeah, I'm just listing everything right now!
And then you go to sleep, enjoy the next day in some calm and beautiful way... and then it's Monday, and you head back to your office... the apartment building staircase where people avoid each other... cars everywhere... couples who seem bored with each other... people working all day with bullshit they hate... humanity collectively very worried about money, borders, property... and all this stuff.
LSD is quite possibly the most powerful thing I've ever experienced. It really is like describing color to a blind person.
You're going to be frustrated if you try to understand it without actually trying it. I just wouldn't recommend it for anyone who doesn't respect it appropriately.