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it's the outside tangible world; not the cloud-cuckoo-land inside our heads, where we build all kinds of more or less (and this is possibly the only thing that's truly "unknowable", at least to everyone except the owner of each head) un-reasonable and un-wise kooky theories and other dogmatic edifices.
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Holding Grey's Anatomy in one hand, the retinal nerves present a 2 dimentional upside down image to the brain.
So everything you view is flat and upside down. Your reality is an interpretation of tactile senses, not what is actually there. Reality is a knowledgable guess based on bumping and falling down. Not a measurable experience. A blind hooker might think she is eating a hot dog several times a day and complains to the pimp about the mustard. Since reality cannot be measured except by agreement, a machine that measures according to our standards might just think it is slurping clams.
thanx,
bill