?? (any??) picture of "wave" (?? -function ??? ... ?? eigen- ??? ....???) as secretly picture of ... ??? harmonic representative of homotopy class .... ???? .... ???? .... ???? ....

?? relationship to "side view of helix for observer at infinity" .... ??? ....

xkcd .... ??? ....

?? general theme of ... ?? "hidden dimension" ... thing whose behavior appears more natural (??) from higher-dimensional (?? ... ?? vs "co-higher" ??? ....) perspective ...

??? ??cross-dimensional application of cavalieri's principle ...

?? manin ... gyroscope ... ??? .....