It’s easy to rush through Paddington in the hordes of commuters and tourists. Watching over all this is a clock suspended over seven meters from the ground. Inside, there appears to be a man painting and erasing the hands of time. If you don’t see him, he’s gone for a very brief break, but he works almost constantly so that commuters can catch their trains on time. This is the Real Time Clock, one in a series of timepieces created by the Dutch artist Maarten Baas. Some of his other…