Bast studied plastic arts. He became an independent artist and cooperated on the organization of O.G. Boiscommun's 'Rêves Obscurs' exposition in 1998. He then teamed up with Boisommun and did several illustrations jobs at Bayard Presse. He is the artist of several comic books at the publishing house Le Cycliste, including 'Entrave' (1999), 'Petite Méthode Pédagogique' (2002, text by Denis-Pierre Filippi) and 'Le Gardien de la Tour' (2004, with Matyo). He has also cooperated on the collective album 'Pars - Chanson d'Higelin en BD' at Éditions Petit à Petit.