This Thursday marks the start of the four-day 2017 Signal Festival, an
annual light show in Prague, billed as the biggest cultural event in the
Czech Republic. The festival, which began in 2013, celebrates light art,
with various dazzling installations from a variety of global artists wowing
visitors around the capital. I spoke with festival organizer Martin Pošta
and began by asking him to describe what is in store for this year: