A businessman who believes the earth is flat has spoken out about how he believes his views could put him and his family in danger.
There is a growing community of so-called 'Flat Earthers' and numbers have grown in recent years thanks to a strong YouTube community online.
They believe society has been brainwashed into believing the earth is round.
Robin, 52, runs a group of about 20 similar-minded individuals and says he is looking to trigger a "mass awakening", but believes that making his views public could affect his business, himself and his family.
"I worry very much that something might happen to me," the grandad told Bristol Live .
"I first came across the subject when my daughter came home from work one day in 2015.
"Someone at work had told her the Earth was flat. I chuckled and said, 'Don't be silly. What about the photos of Earth from space?'
"My daughter shrugged and told me, 'I'm just telling you what they said'."
But Robin couldn't rid himself of the idea, and began watching YouTube videos on the subject.
"I watched half a dozen videos, and the things I thought would stand up in my own mind soon fell apart," he said.
"It took me two weeks to get past my programming. It was pretty devastating. You realise you have been lied to."
Robin's ultimate goal is to change the education system.
"At the moment, the shape of the planet is taught in a partisan way, which is a breach of the Education Act," he said.
"They should teach different theories with balance."
Robin has images of what he believes is the Earth's "wonderfully designed system" - a flat surface under a dome which also contains "a local sun and a local moon".
According to his theory, the sun is not millions of miles away but just a few thousand, and a "much smaller" size than Earth.
He says this is supported by light appearing to be "local" when it shines through clouds.
He believes day and night are explained by the sun moving over different points of the Earth and leaving others dark - the sun moves but the Earth does not - and described gravity as a "magical, mythical force" while things fall simply because of "buoyancy and density".
Other theories include that NASA uses CGI and Photoshop to copy and paste clouds onto pictures of Earth from space, and footage of astronauts walking in space really shows them moving through water.
He believes there are huge amounts of natural resources like gas, oil and uranium hidden in land beyond "the perimeter" of Antartica. "Banking families" or "the powerbrokers" control governments to perpetuate the myth of a globe, so they can access the resources without accountability.
"I worry very much that something might happen to me," he said.
"But I have made myself visible in the community. If I suddenly vanished, it would be a bit obvious."
Robin is careful about who he discusses the subject with.
"I have a successful business," he said. "I don't want clients knowing about it. They might think 'his head's in the clouds'.
"I maybe test them to see how receptive they are with a slightly different subject like 5G or chemtrails."
However, he can often be found handing out Flat Earth leaflets and putting up banners in Broadmead.
He said: "It is common for people to laugh. That is a programmed response.
"I'm not a bad salesman, but it's not always possible to persuade people. The programming is deep."
He claims to have converted dozens of people through his activism, and his group of Flat Earthers meets each month at the Punchbowl pub in Old Market Street.
Robin said: "We get lots of different people. We had a young Cardiff University student a couple of weeks ago. Some very intelligent people are into this.
"We talk about Flat Earth and other conspiracies, like the moon landing and how the medical industry is hiding a cure for cancer .
"I've spoken to two pilots who say the Earth is flat. They can't come out because they will get grounded, but they said all the pilots talk about it in their tearooms."
Although he has been converting some family members to his way of thinking, others disagree.
"They have all respected me," he said. "Loving people should be like that. It hasn't led to any rifts."
Robin has three grandchildren aged between two and 13. He says the oldest, a boy, became a Flat Earther within 24 hours of being introduced to the theory. He has not discussed it with the others yet.
"I would say it's appropriate to introduce it at the age when they start asking questions," he said.
"My 13-year-old grandson has been advised not to share his views. It is a pack mentality at school. It's not worth the hassle."
