Sometimes it’s just hard to imagine the size of things when they are written about in the newspapers – or even when they are shown in pictures. A recent TV programme about glaciers and icebergs showed a huge glacier front many kilometres long and very high, but it was impossible to grasp its scale until the research vessel came in shot at the foot of this monster. Of course the place we do fully grasp the size of is our home and its environs. So maybe some innovative software company could create an app which would enable you to select an object or geographic place and have it inserted into a picture of your house. With appropriate accompanying sounds, the insertion of the Grand Canyon into the back garden (and surrounding land for many miles each way) would be both dramatic and instructive.