It is considered a piece of art because the structure is very unique with all the different types of shapes and sizes . In this artwork it creates void spaces in between various spaces. The color is very outstanding and bright which would grab someone’s attention.
The Romanesque period is the first since archaic ans Classical Greece to take its name from a artistic style rather than from politics or geography.
In Romanesque period, there was a sharp increase in trade. Romanesque is a style of architecture developed in Italy and western Europe between the Roman and Gothic styles after 1000 AD. The projecting transept marks Pisa Cathedral as Romanesque.
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Well we have a lot of symbolist painters..
Gustav Klimt
Edward Munch
Frida Kahlo
A lot of painters..
hope my answer helped