A bright green horse was projected across the sky over Nottingham late last month. It wasn't a Bat-Signal-style projection that was made from a searchlight on the ground. Instead, the silhouette of a rider on a horse was projected directly onto the clouds from a Cessna 172 aircraft that flew over the city in the UK. Artist Dave Lynch created the first of its kind mobile projection with a zoopraxiscope, a movie projector that made its debut back in 1879. He repurposed the historical device and swapped its original light source with a laser for precision and efficiency. The display wasn't clear from the ground, but viewed from the plane it looked like a horse galloping through the dark clouds.