Amir uses perspective trickery

Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.

Initially, Amir seems unable to find a hat, despite actually wearing one. He considers what distance is, and eventually opts to try a perspective trick. He hangs a hat on a bush and positions Olli such that, when viewed from a table on the other side of the garden, it appears that Olli is wearing the hat. He spends most of his time adding multiple hats to the bush, and repositioning them to make it easier for him to line them up from his viewing position. He instructs a cameraman to get up onto the table, to shoot footage of the perspective illusion. Atle accepts Amir’s method, through which he was able to get a hat onto Olli’s head from a distance of 22.5m. He earns fourth place in the task.

(Written by Will G and edited by Karl Craven)