Barely related, but in Bern Gerechtigkeitsgasse they made an almost hidden art installation so that the Stadtbach (city stream) flows uphill in a small part. It's very fun to watch.
"The city stream is redirected in an underground, invisible loop so that it flows backward, or upstream, for a short distance. However, the backflow is always just outflow in reality. This is because the watercourse has a continuous gradient." (translated from a Google result excerpt of this paywalled article [0])
mavhc|1 year ago
wumms|1 year ago
[0] https://www.derbund.ch/warum-der-stadtbach-aufwaerts-fliesst...)