Who thinks when you work with AI?

Every answer AI gives you closes a space that once belonged to you,  the space between not-knowing and knowing, where thought used to take shape. That space leaves a trace. We call it the Residuum the structural mark left behind when a mind is truly constituted by what it engages with, not merely served by it. We built the first instrument that measures this trace not what you use, not how fast, not how often.