For a very long time, people couldn't have imagined a circus without horses, elephants, monkeys and lions. But recently, Circus Roncalli has shunned tradition, swapping flesh and blood for holograms. The shows, however, remained just as spectacular.

For a very long time, people couldn't have imagined a circus without horses, elephants, monkeys and lions. But recently, Circus Roncalli has shunned tradition, swapping flesh and blood for holograms. The...