His extensive travels would eventually also bring him to New York City, London, the Netherlands, Spain, Morocco, Ceylon (now Sri Lanka), India, and Japan, images of all of which appear in his work.

Šimon's style was strongly influenced by the French Impressionists and, perhaps through them, by Japanese printmaking techniques, in particular color aquatints with soft ground etching.

On his return, he compiled his correspondence and released the book Listy z cesty kolem světa (Letters from Around the World), published by J. Otto, Prague in 1928.

His notes and letters home reveal a world that was unknown by those in Old Europe – a challenging new mechanistic society in America, a transforming Empire in the Far East, and an untouched paradise in the island of Ceylon.

His glimpses into the past provide us with a view of history, through the eyes of a painter, that takes us back to a time when neon lights were marvels, when geisha were icons, before commercial air travel and when the only way to share your adventure with loved ones and family was through sending letters home.