Alexandru Ciubotariu, a.k.a. Pisica Pătrată was born in 1979 in Călărași, Romania. He lives and works in Bucharest.

He graduated in Graphic Arts from the George Enescu National University of Arts in Iași. Since 2017 he is a member of the Romanian Union of Artists. The Square Cat, the character that made him famous as an urban artist, can be encountered in the most unexpected places in Bucharest and in many other Romanian cities, on walls, meshes, in bookstores and other public spaces. The Square Cat became a protagonist of the first street art book in Romania, published by Vellant in 2009. He participated in over 100 exhibitions in Romania and abroad, he is the founder of the Comic Strip Museum, in partnership with the National History Museum of Romania and published his works in over 90 magazines in Romania, Belgium, Slovenia, Poland, Croatia, Czech Republic, Greece and Serbia. He illustrated over 20 children’s books and in 2021 he curated and participated with a live drawing at the exhibition _155 Years of Comic Strips in Romania, 1860 – 2015_, at the National History Museum. He illustrated over 50 comic books and his works appeared in over 10 street art albums. He is a recipient of over 35 awards at art competitions, festivals and comic book salons.