故事中的訊號借自自然界以光說話的方式：螢火蟲用閃光的長短與間隔辨認彼此，頭足類以皮膚上流動的明暗傳遞訊息；高山上背對太陽時，人的影子會落進下方的霧裡。光潮群與它的語法，是本書的創作。
來源與參考
故事參考：Sara Lewis, A Guide to Lightningbug Linguistics (2018)（https://silentsparks.com/2018/06/02/a-guide-to-lightningbug-linguistics/）；How et al., Dynamic Skin Patterns in Cephalopods, Frontiers in Physiology 8:393 (2017)（https://pmc.ncbi.nlm.nih.gov/articles/PMC5474490/）；NOAA Ocean Exploration, What is bioluminescence?（https://oceanexplorer.noaa.gov/facts/bioluminescence.html）
The signals in this story borrow from the ways nature speaks in light: fireflies recognise one another by the length and spacing of their flashes, and cephalopods pass messages through moving patterns of light and dark on their skin. On a mountain with the sun behind you, your shadow can fall into the fog below. The light tide and its grammar are invented for this book.
Sources
Story references: Sara Lewis, A Guide to Lightningbug Linguistics (2018) (https://silentsparks.com/2018/06/02/a-guide-to-lightningbug-linguistics/); How et al., Dynamic Skin Patterns in Cephalopods, Frontiers in Physiology 8:393 (2017) (https://pmc.ncbi.nlm.nih.gov/articles/PMC5474490/); NOAA Ocean Exploration, What is bioluminescence? (https://oceanexplorer.noaa.gov/facts/bioluminescence.html)
