once in amaryllis 's car , permitted to sit in the front seat as a special treat , as well as a treat for christopher , who no longer flinched as they went round corners but was still in danger of embarrassing himself and everybody else by throwing up , marina miraculously turned into a young girl again , apparently impressed by the sleek lines of the cars exterior , the dashboard resembling that of a jumbo jet , or just by amaryllis 's turn of speed .