.....or : https://imgur.com/4rf5w (https://imgur.com/4rf5w)
https://www.shutterstock.com/image-illustration/perpetuum-mobile-ernst-mach-303855833
.....versus : www.geocities.ws/iacob_alex/Some_Drafts/text036.jpg (http://www.geocities.ws/iacob_alex/Some_Drafts/text036.jpg)
Al_ex