Subjects for very small books

It seems to me a small book can only harbour a modest content – great and serious ideas can not be accommodated in a little book – they need long words and many sentences – but is that so? – a short poem can express a wonderfully  imaginative idea – do I suffer from weak self-confidence? – have I chosen the miniature book only because I have no great ideas – is that so? – you see: self doubt – but no, I have deliberately chosen to express modest, unassuming ideas – the miniature size is appropriate – small and trivial subjects should only occupy small space