Clive Thompson on Nostr: In the late 1980s, Robert Martiensen -- a retired math teacher in Australia -- ...

In the late 1980s, Robert Martiensen -- a retired math teacher in Australia -- retreated to his farm house and began making art

A *lot* of art

In absolute secrecy

By the time he died in 2007, he'd painted over 4,000 abstract canvases and built over 2,500 sculptural wooden boxes

They were stacked *everywhere*

And no-one had ever seen them

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