Alphen aan den Rijn
Can we play cards upside down to reverse the actions?
You never can reverse an action.
The rules say:
When a card is played, it must be placed on the discard space of the game board, so that one main action is oriented towards the side marked with =filled-circle-in-square= and the other towards the side marked with =3-open-circles-in-squares=. First, the player whose turn it is will perform the main action that he placed on the =filled-circle-in-square= side or one of the 2 alternative actions. Then, continuing clockwise, each of the other players perform the main action on the =3-open-circles-in-squares= side or one of the alternatives.
So the orientation of the card on the game board will show which main action the player who played that card can take. The other main action is available to the other players.
And yes, if a player place the card "upside down", he can take the "bottom" action (which is now located at the =filled-circle-in-square= side of the discard space).
The orientation of the pictures on the card (they are both upside down or not) does not matter.
... and why we do not speak in the rules!
See quote above.
Both pictures on the card in the same direction is probably an aesthetic choice.