I looked at a lot of Magritte's work in the Brussels Art Museum a few years ago and liked this one maybe because it was closest to a contre jour photo. Until you look twice it seems like a normal painting unlike almost all of his surrealist work such as the " Lost Jockey" and others even more surrealistic. It stands out because it is almost normal. Equally some might say that IR shots especially on HIE are almost surrealistic because of the strange light and glow.
A lot of surrealism has to be looked at very closely. Most of it doesn't reveal itself fully otherwise. One problem is that Magritte took years to do all his paintings and each demanded a great deal of his time and thought. We try and view them all in say a couple of hours and wonder why only one or two strike any chords immediately!