At the same time, he continued to develop some of the themes he had used during his "space" period, especially experimenting with the effects of color.
但「太空畫」階段使用色彩的經驗，使以後的作品在色彩上顯得更豐富。他常常使用噴槍在畫上噴白、噴綠、噴藍，一面遮蓋了失敗的線條和筆觸，一面賦予畫作更深的層次感，使強烈的畫面趨於柔和。