Why was Barnett Newman's painting Cathedra attacked in 1997?

the meaning you find from looking at a visual, either in parts or as a whole

the study of signs or communication

the literal, or real, meaning of what is being communicated

The attacker claimed he and Newman completed "Who is afraid of Red, Yellow, and Blue" together and hated how the restoration was done. However, it wasn't up when he went, so he took out a knife and destroyed Cathedra. I do not remember his name. I believe it was in 1997?