Love this! My favourites:
The winner of this: https://ambigr.am/contest/sayings
And every single submission for this is amazing: https://ambigr.am/contest/duality
Also nice tip: You can click on the image and it will flip it for you. Especially useful if viewing on a computer, and also because some of them mirror instead of flip.
Maybe you would like this one: https://ambigr.am/post/sun--moon-poems It's the longest ambigram in the world, 2 poems. You read the first poem then turn it over and read the second!
I don't really get this one: https://ambigr.am/contest/sayings. The "up" is supposed to turn to "do" but I don't recognize neither the "d" nor the "o".
Took me a moment too - it's a capital 'D', at about the same angle as the second 'm'. The 'O' just has an extraneous line through it (which was the stem of the P).