Discussing this period in Castel's work, Dr. Haim Gamzu noted: "Castel is one of the most interesting phenomena in Israeli painting. He, more than any other painter in this country senses the colourfulness of the Orient, the charm and grace of houses with domes and vaulted ceilings, the beauty of the arabesque, the mysterious magical quality of symbol... Instead of immigrating into the country he was born here. And he has always known how to absorb the melody of its colours... red, green and blue are Castel's palette: the flaming red of the tarbrush, the green sycamore newly-washed by the rain, and the violet blue so beloved by the East." (Haim Gamzu, Painting and Sculpture in Israel, Tel Aviv, 1951, page 28).