The motif is a cumulonimbus and the bottles have painted by Giorgio Morandi. I have focused on gaps of objects. Objects have got own forms, and when they are put separately, gaps appear. The gap also has own form, and the form changes when we move objects. For example, when we put a object near to the other, the gap becomes narrower or disappear. I have aimed to express "everything exists not by itself but by mutual existence.