I Space and time are of course representations a priori, which dwell in us as forms of our sensible intuition before any real object has even de termined our inner sense through sensation in such a way that we rep resent it under those sensible relations.b This material or real entity, however, this Something that is to be intuited in space, necessarily pre supposes perception, and it cannot be invented by any power of imagi nation or produced independently of perception, which indicates the reality of something in space.