Below, its frieze was adorned with the eight wind deities. The 8 m high structure also featured sundials and a water clock inside dates from around 50 BC.[40] Clock tower 50 BC See Clock tower.[41] Automatic doors c. 1st century AD Heron of Alexandria, a 1st-century BC inventor from Alexandria, Egypt, created schematics for automatic doors to be used in a temple with the aid of steam power.[31]