Simple. Lego recreation of which masterpiece?

Cracked by: Logik , Gurupad , Ananth , Goyal , SV , shrik , byslexia , Bheema V , Girish , krudebox , Manish Achuth , Rogi , Bharath , Anjul , username , v.chandrashekar , Dibyo , dheeraj , Vasanth Kamath , Vardhan Shenoy , Rahulk , Qbrain , dineshk , Rahul Rajeev , vijayaraghavan , lanu and Jean Valjean

Answer: Ascending and Descending by M.C. Escher