At first glance the top photo reminded me immediately of something M.C. Escher would have drawn...Similar in theme to "Up and Down" and "Relativity"...Now whether it could be defined as abstract or not is a differnt matter. MC Escher was a genius with symmetry drawings and unreal POV's. Some of his work takes a minute to absorb but you eventually figure it out. Escher was abstract in his thinking and POV but his subjects for the most part are recognizable. Sorry...I don't have any links to Escher..perhaps going to GOOGLE and typing in MC Escher would land on his work.