Does heaven exist? With well over 100,000 plus recorded and described spiritual experiences collected over 15 years, to base the answer on, science can now categorically say yes. Furthermore, you can see the evidence for free on the website allaboutheaven.org.

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This book, which covers Visions and hallucinations, explains what causes them and summarises how many hallucinations have been caused by each event or activity. It also provides specific help with questions people have asked us, such as ‘Is my medication giving me hallucinations?’.

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Observations placeholder

Oliver Sacks - Zelda



Type of Spiritual Experience


Number of hallucinations: 1


After a PET scan Zelda found she had damage to her occipital and parietal lobes

A description of the experience

Oliver Sacks – Hallucinations

As we drove away from the beauty parlour, I saw what looked like a teenage boy on the front hood of our car, leaning on his arms with his feet up in the air.

He stayed there for about five minutes. Even when we turned he stayed on the hood of the car.

As we pulled into the restaurant parking lot, he ascended into the air, up against the building, and stayed there until I got out of the car…..

I see planted fields, flowering, and many forms of medieval buildings. Frequently I see modern buildings change into more historic looking ones. Every experience brings something different.

One of her new hallucinations, she said, "is very difficult to describe. It's a performance! The curtain goes up and 'performers' dance out on the stage - but no people. I see black Hebrew letters dressed in ballet dresses of white. They dance to beautiful music, but I don't know where it comes from.

They move the upper parts of the letters like arms and dance on the lower parts so gracefully. They come onstage from right to left

The source of the experience

Sacks, Oliver

Concepts, symbols and science items



Science Items

Activities and commonsteps