A sketch is not just superficial lines:

‘The Solicitous Balloons’ looks like a collection of short-stories, but a reader invariably feels that these are not short stories. They are all deeply rooted to contemporary reality. As a genre, they have better claim to sketches. They are linear brief presentation of what author sees. A sketch is not just superficial lines. The lines reveal the inner world through suggestion. These sketches also tell more things between the lines. They tell us of new dimensions hidden in the apparently simple anecdotes. The Solicitous Balloons present an interesting and pleasant reading.