Pilobolus Dance Theatre (Joyce Theatre, 175 Eighth Ave. at 19th St., July 16-Aug. 11). Half modern dance, half gymnastics, frequently amusing, often enthralling, always watchable. Three different programs this summer, including three new dances and revivals of such favorites as “Day Two” (the company’s wildly sexy signature piece), “Pseudopodia,” and “Walklyndon” (TT).