His point was that the idea that the rock is just another mental image and has no material existence of its own is a poor explanation of the painful sense data he had just experienced .
as he kicked a large rock and his leg rebounded .
His point was that the idea that the rock is just another mental image and has no material existence of rock 's own is a poor explanation of the painful sense data he had just experienced .
as he kicked a large rock and his leg rebounded .