Moveable cone + net - freibeweglicher Kegel + Netz
Wickikegel
Net started with sortest/longest line segment
variable net beginning with S_k (line segment S_k-S) controled by slider k
(https://www.math.kit.edu/didaktik/~dittrich/media/schiefe_koerper.pdf)
Abwicklungen (net curves)
