What is haiku? Here is a concise answer that I particularly like:
Originating in Japan, haiku is brief, objective and sensory – a literary snapshot of a moment in nature. Most haiku take longer to think about than to read. In this way, haiku are written not just by the poet, but also by the reader who brings his or her own set of experiences to the poem, allowing it to blossom differently for each person.
This explanation comes from The Holden Arboretum, where their Seasons of Haiku woodland trail, which uses QR codes to share seasonally themed haiku, garnered an outstanding 1,436 unique scans during its first month.