Since the days when cavemen began drawing on the walls – everyone has, at some point, displayed art in their home. In the beginning it was probably something we painted ourselves at kindergarten, aged four and a half, for mum to proudly display on the fridge in the kitchen, developing in our teens to the picture of the girl scratching her bare bottom on the tennis court or, in our later years, a genuine impressionist painting by an elephant called Tojo, purchased while on hol…