Click or tap once to cast the moon blocks (跋杯 “po̍ah-poe“) and hit the stamp to reset.
These moon blocks are common divination tools in Taiwanese temples. The basic idea is to formulate a question for the gods in your mind, then cast the moon blocks to get their answer.
When the moon blocks each land on a different side, this is 「聖杯」 or “sèng poe”. If you see this symbol (in the simulation above it is represented in seal script as below), it means the gods allow what you’re asking, they agree or things will go to plan. Normally you have to get this result three times in a row to be sure of your answer.
If you’re overly anxious or a little flustered, you might not be super clear on how to ask the question. If this is the case, you may well get the 「笑杯」 or “chhiò poe” (both flat sides facing upward) response from the gods. This represents the gods laughing, either because they are confused, need more time to think on your problem or need it formulated more clearly. If you get this symbol, you can either cast the moon blocks again or try to rephrase the question before doing so.
The final possibility is 「陰杯」or “im poe” (the flat sides down), which indicates that the gods do not agree, that they’re angry or that things will not pan out smoothly for you. If you get this result, you can try asking again or ask something else. This one is also referred to as 「無杯」”bô poe”, 「怒杯」 (seemingly only in Mandarin) “nùbēi” and 「哭杯」 (this is a dangerous one, as it has a similar pronounciation to a swearword in Taiwanese (「哭父」 khàu-pē).
If you visit an actual temple, it’s usual to draw a lot with a number on it that corresponds to a drawer with a fortune inside it. When you first draw the lot you can ask the gods if it’s the right one by casting the moon blocks. It might take you quite a few tries before you can finally get a drawer. Most temples will have fortune tellers on hand to decipher your fortune for you. Longshan Temple even had fortune translations in English last time I visited.
I created this simulation together with Arvid Torres who was also behind all the visuals. The Unity Engine uses physics, so the random factor is there for the gods to play with if they wish.