Hi I'm confused by the meaning of '' the vigor and the incredible energy the re-workings were'' in the below context. Would you tell me what the speaker is trying to convey by saying '' the vigor and the incredible energy''. Is he trying to say how difficult the ACT of reworking was? Or is he actually telling how ENERGY and ENTHUSIASM had been applied to create the paintings that he was trying to rework? The text: That X-rays, ultraviolet and infrared photography, and chemical analysis -- tools used to probe works centuries old -- are now being employed on more recent art confirms that modernism has entered history. They not only help conservators understand how a work was made but, when sensitively deployed, can help them recover the living artist from the evidence of the mute painting. Such an approach is much in evidence in the exhibition ''Mondrian: The Trans-Atlantic Paintings,'' on view at the Busch-Reisinger Museum through July 22. The paintings they are, begun by Piet Mondrian (1872-1944) in Europe and completed in New York, were scrutinized using the latest scientific techniques. In this case, technical analysis revealed something unexpected in the character of the notably reserved Mondrian. ''What really surprised me,'' Mr. Spronk recalled, ''was the VIGOR and the incredible ENERGY, how laborious these re-workings were and to what length Mondrian went to attain these paintings' serenely abstract works.