Funny!
Only thing that takes away from the illusion are the shadows. On the boy's right foot the light source is level or below the foot, on the gaffer tape roll it's more or less from above and on the girl head it's above right. Furthermore, the direction of the shadow of the girl would indicate that the wall is just a continuation of the floor in a different color - for the illusion of a straight wall I think her shadow would have to be upright on the wall.
I wouldn't be able to create something remotely comparable, so don't take my nitpicking too serious, it's just as a remark of a possible improvement.
OMG .. !! .. this is BRILLIANT .. particularly loving the girls expression .. and her hand .. almost giving the finger .. perfect ...
and the boy .. lol .. !! .. bet this is something a lot of sisters would like to do to their younger brothers ... temporarily of course .. ;)