Politicians are often accused of being see-through. But ACT leader David Seymour insists he is not a hologram.

The Epsom MP and parliamentary under-secretary was moved to deny the suggestion after an unusual Official Information Act request to Prime Minister John Key's office.

The author, known only as Zoe, asked: "Can you prove that David Seymour, ACT MP for Epsom and friend of the National Party, is a real person and not in fact a hologram created by you, whose functions include agreeing with everything you say and being the butt of all jokes for a while?"

Seymour says Key's staff contacted him on Tuesday afternoon about the request. "You'd think if you were going to create a person from scratch, you would've done a bit better."

However, he added: "I'm not sure he has prime ministerial responsibility for my physical make-up.

Seymour has offered to prove he is flesh and blood - for a charge. He'll donate any proceeds to saving Auckland's threatened kauri tree. "I'm thinking about offering proof. The thing about a hologram is you can't touch it. I might invite people to test for themselves - $5 a feel. People can touch me on the shoulder."