The salaryman in his dark suit looks rather surprised and confused.

"Where are Elsa von Freytag-Loringhoven and Marcel Duchamp?" the foreign artist had just asked him in perfect Japanese, thrusting a small video camera in his face.

He clearly has no idea. "I am not surprised," says the artist who goes by the name Mario A. "Some people know the artist Duchamp, but nobody knows this woman, his partner and an artist herself. But both are long dead." He chuckles and zooms his lens onto the colorful neon signs in Shinjuku.

"I am making this video film as a homage to this woman artist, who, unfortunately, is long forgotten, by asking people in the streets about them and mixing in sequences of Tokyo, to create my very own Tokyo documentary video during this summer," says the 47-year-old Mario.