(2.1) We suppose ourselves as human to be sentient, ie. to be capable of experiencing sensations, thought, or feeling. And we take that sentience as being our connection with the is of reality, whatever its forms, as a living organism. That sentience is the only pathway to our brain for making impressions of is in time present and sometimes for subsequent storage as knowledge of is in time past in the form of what we call memory.

(2.2) Storage of knowledge in the brain is imperfect.

(2.2.1) Sometimes the impression made on the brain as perception of is in time present is imperfect. This impression can be subsequently stored as memory in the physical brain as brain memory as false knowledge.

(2.2.2) Sometimes we forget, that is we lose knowledge of time past, and sometimes we recall "knowledge" from time past erroneously stored as false memory.

(2.2.2) Sometimes we even form "memory" of things and events that never were as false memories.

(2.3) Sometimes we combine knowledge stored as memory to create new, synthetic knowledge that transcends the experience of the reality of is to formulate what we shall call ideas. Sometimes these ideas may reflect reality and sometimes not. Ideas must be proven by sentient observation to be held as reality. Examples of ideas include theory, hypothesis, guess, notion, assumption, concept, postulate, interpretation, impression, suspicion, etc.

(2.3.1) This philosophy is an example of an idea for which some parts may be proven a fact of reality and some parts not.

(2.4) Reality can present in four forms:

(2.4.1) Reality we can know and do know. Reality we have experienced either directly as perception or indirectly by either by measurement or through communication through media with another sentient beings. Media includes, but is not limited to, written and spoken language, audio recordings, visual recording, mime, etc.

(2.4.1.1) Measurement is defined as quantification of attributes of a entity or action, which can be used to compare with other entities or actions. In other words, measurement is a process of determining how large or small a physical quantity is as compared to a basic reference quantity of the same kind. As an example, the measurement of the temperature of a entity is a quantification of the actions as motion of the atoms or molecules of which it is comprised indirectly by observation of, for example, the changes in the height of column of mercury in a thermometer as a result of expansion of the mercury as the temperature increases or decreases with contact of its environment. The temperature of the air is 95º Fahrenheit or 555° Rankin today. This is referenced to a temperature of absolute zero (-460 ° Fahrenheit or 0° Rankin) at which atoms and molecules do not have any motion whatsoever. Other methods include the observation of movement of a entity composed of two different metals that expand at different rates with an increase in temperature in a thermostat and measurement of the changes in the voltage potential produced by the junction of two dissimilar metals when the temperature changes. The air conditioner thermostat is set at 72° Fahrenheit today. We can also measure the wavelength of light emitted by all entities at temperatures above absolute zero. My infrared optical thermometer indicates that the sidewalk temperature is presently 102° Fahrenheit. On the other hand, our bodies can directly sense temperate and temperature changes through heat sensitive cells and our neural systems in our skin but cannot directly quantify the temperature through measurement. We can only say we have the sensation of feeling hot or cold. Sensations are not directly measurable.

Measurement enables us to gain knowledge of aspects of is for which we are not directly sensate. These include not only temperature but also things such as electromagnetic, gravitational, and quantum fields.

Measurement is a fundamental tool used in the conduct of the natural philosophy that we call science.

The use of measurement instruments for aid in making observations of the physical world beyond the scope of direct human sentience has been the single greatest boon to human knowledge The human brain has not significantly increased its capability for intellect for over 100,000 years. But the invention of the telescope enabled great strides in astronomy and the invention of the microscope enabled great strides in biology. The invention of xray imaging enabled us to peer inside opaque to us. The simple scale (ruler) enabled us to more accurately quantify dimensions. The invention of the sundial and clock enabled us to measure changes. The compass along with eh ruler enabled the logic of geometry. The development of the slide rule enabled faster and more accurate scientific calculators. The development instruments for xray diffraction enabled us to know how atoms are arranged in crystalline materials. The development of spectrographs enabled us to know of what elements a material is composed. The invention of the thermometer enabled us to quantify the thermal energy in bodies. And, most recently, the James Webb telescope makes astrological observations near the edger of the universe using a spectrometer to observe infrared light completely invisible to the human eye. The Large Hadron Collider (LHC) has enabled us to detect the miniscule Higgs boson and the LIGO (Laser Interferometer Gravitational-Wave Observatory) has detected miniscule gravitational waves. both which we are complete insensate. These instruments do the observations for which humans are so poorly equipped by nature itself but both which have so greatly contribute to human knowledge.

(2.4.2) Reality that can know but don't know. This is reality that we can know but have not yet acquired knowledge of it. It is likely there exists more reality that we don't yet know than that we do know. Indeed, the volume of knowledge is presently doubling every 12 hours, while the doubling rate was 25 years in 1945.

(2.4.3) Reality that we can never know. We cannot know what we cannot know by acquisition of knowledge. For example, we can never know the reality of subjective experiences such as consciousness and other qualia even though we can know their objective causes.

(2.4.4) Nonexistent reality. What isn't is but may be falsely held as is, that is, a false reality in and of itself, a creation of the mind, existing only in the mind and not external to it. These we shall call myths.

(2.5) This philosophy holds that all else that might exist is unknowable by humans and, as such, are not a part of the human experience of life and living.