As a child, Yohai loved finger painting and drawing. Turtles and cats were favorite subjects. Yohai drew, for example, how he imagined men had evolved from cats! He illustrated stories he liked, drew comics, wrote satiric materials, enjoyed wordplay, optical illusions, and scientific writings. He loved mazes, puzzles, crosswords, and math. Yohai had a fine aesthetic sense, was a perceptive observer, and a writer of wit and intelligence. Some of his creativity was expressed in computer programs and adventure stories (which are not included here). These selections are arranged by years.