One of the almost undeservedly forgotten Italian painters is certainly Ennio Morlotti. He was a pioneer in presenting nature as an almost abstract subject . His plants, vegetation paintings are really one of kind . Study these closely and you will see the realistic elemts but admire them in a glance and the only thing you will notice is an abstract work of art. I like his paintinsg although in the Netherlands you will not encounter them in our museums. You better go to Italy and visit the Modern art museums in Rome and Torino. Compare his painting with Marc Mulders.
left Morlotti and right Mulders
He almost works the same , but has a style of his own. Both these artists are personal favorits, but where Morlotti is not known over here and Marc Mulders is known here and abroad.
http://www.ftn-books has some nice Morlotti titles available.