Seeding is believing (cap.34)

After seeing Lena and Nil putting seeds in the garden, Bip wants to join them to plant...
whatever: a light bulb, a bike-bell... or any crazy thing. The kids laugh at first, but when they
see the results ¿ A real lamp! A brand new tricycle! ¿ everybody wants to seed and do crazy
wacky dances with Bip.