A cryptocurrency entrepreneur who bought a piece of conceptual art consisting of a simple banana, duct-taped to a wall, for $6.2 million last week ate the fruit in Hong Kong on Friday.

Justin Sun walked into the room flanked by his usual entourage of bodyguards and advisers and made his way to the stage. Behind him, a banana was duct taped in position on a white wall. On either side, two blank-faced men in white shirts and black aprons stared into the sea of cameras and smartphones. I wondered what they were thinking.