Fanaa / Baqaa

Engraved interactive Klein bottle

Drag the plate, or focus it and use the arrow keys, to orbit the Klein bottle. Use Tab to focus Fanaa, Baqaa, or the caption term; the definition appears in the panel at the foot of the page; Escape clears it.

Fig. I - the non-orientable surface: no seam between inside and outside. Procession and Reversion.

Design note: the Klein bottle appears here because the form says the pairing: a single non-orientable surface with no seam between inside and outside, the return not a second loop but the same surface continuing.