Of course, I think that next to the German version of Mission to Horatius, the original "Orange" cover could be in the running for weirdest cover with those black things and stripes throughout the picture. What were they suppose to be, a scale?
-- he's holding an Erlenmeyer flask. The cover was evidently based on an early publicity photo of Spock handling lab equipment, and he's standing behind the pipes and flasks of a chemistry lab setup. I can't seem to find the original photo anywhere, but I imagine it was from the same photo shoot that produced this image