Locke notes that, when we try to subtract the idea of a prim…

Questions

Lоcke nоtes thаt, when we try tо subtrаct the ideа of a primary quality (e.g. extension) from an idea of object in our imagination (e.g. an imagined cube), the idea of that object disappears (e.g. the imagined cube disappears). What is this suppose to show?