Knight of coins: "When paradigms shift, worlds change"
A glass half full, or a glass half empty doesn't change the glass, but it makes our experience totally different. You don't need to change the water in the glass to change your perception of it.
Perception is a coin card because it so strongly relates to wealth and contentment. If we have enough, and appreciate that sufficiency, then there is no need for excess. This is just like the Buddhist notion of non-attachment. It isn't lacking something that makes you unhappy...it is the wanting that something that is the problem...of course this applies to the the extra 'somethings', beyond survival, beyond life necessities. There is a difference between wanting a bowl of rice to survive another day and wanting to drive a bigger car.
I forget where I heard it, but it true..."the wealthiest man is the one who wants for nothing".
Whether that means having so much stuff that you don't want anything...or just not wanting all that extraneous stuff you don't have...well, that is your choice, your perception.