What is "small circle" Tai Chi, what is "internal"?

http://youtube.com Besides my own personal study in the 70's, 80's and 90's for a considerable time at numerous locations, particularly Youtube. I did a search of all of myriad sources, websites, videos, images, articles for actual instruction on true "small circle" Tai Chi and I do not find "small circle" Tai Chi being taught. Although I saw the words "small circle" used quite frequently, a critical examination (with an accompanying comparison to Classical Tai Chi) of the body structure, foot positioning, size of footsteps, (in many cases "extraneous") movement of the extremities, and lack of "internal movement" from the core of the body, demarcation/delineation of yin and yang, positioning of yin/yang pairs, etc. revealed to me that there is no "small circle" Tai Chi being taught. This picture gives a good comparison of what is "small circle".

 In the truest sense, saying one's Tai Chi is "small circle" is like saying their Tai Chi is "internal". Recently, a new student said "...internal is what my teacher is teaching in a particular Style short form.." yet I asked the student to show me their "internal" and they said"...well, that is what my teacher said he was teaching...". I think "caveat emptor" is particularly germane to what we discuss along with "all that glitters is not gold". wherein the attractive "external appearance" of something is not a reliable indication of its true nature.