The wall of death, somehow appealed to sidecar lions!

Why Mr Egbert has a lion that loves a drive on the wall of death is a mystery

and Ethel Purtle with her lion King:

https://www.factinate.com/things/38-astonishing-facts-historys-craziest-circus-performers/

http://en.wikipedia.org/wiki/Wall_of_death

Mr Egbert taking his 5 year old lion out for a ride on the wall of death at Mitchum fair, Jan 1935. http://www.viewimages.com/Search.aspx?mid=2659974&epmid=3&partner=Google

https://forums.vwvortex.com/showthread.php?5156036-Vintage-photos-Awesome!&p=82966582&viewfull=1#post82966582