For me, the ball and table had no color - they were almost wireframes. I think the task reminded me of studying physics in university so much, that I imagined a diagram of them, not the objects.

Yeah, the more I think about it, what I "saw" looked really like a blackboard drawing of ball and table, including the shading on the ball and everything being from the "default isometric angle".

Weird.

But for the usual "imagine a beach" aphantasia test, I do imagine real beach with sand-colored sand, trees, people, sea, sound of waves and screeching of seagulls. Which makes me think two things - some aphantasia might be learned by teaching people abstract thinking, and that the artificialness of the example might be biasing.