A six-barrel bong, a beer-keg bong, and bodacious bongs, hookahs, and pipes made from traffic cones, pineapples, fruit-juice boxes, musical instruments, drainpipes, and more: In his how-to book Bongology, new from Berkeley’s Ten Speed Press (which is now part of Random House), Spliffigami author Chris Stone is back with ideas and instructions for “creating 35 of the world’s most bongtastic marijuana ingestion devices.” Most of the projects look surprisingly easy.