Prisms are twice as efficient. "Get rid of the grime and let more light in. Truly, truly outrageous."
Own 5 prisms
Prisms are twice as efficient. "Delve into the untouched optical depths where even the mantis shrimp hasn't set an eye!"
Own 25 prisms
Prisms are twice as efficient. "Bask into its cocoalesence. (Warning : may cause various interesting albeit deadly skin conditions.)"
Own 50 prisms
Prisms are twice as efficient. "Remember the different grains using the handy Roy G. Biv mnemonic : R is for rice, O is for Oats... uh, B for barley?..."
Pure cosmic light
Own 100 Prisms
Prisms are twice as efficient. "Your prisms now receive pristine unadulterated photons from the other end of the universe."
Own 150 Prisms
Prisms are twice as efficient. "Your prisms now glow in the dark, effectively doubling their output."
Own 200 Prisms
Prisms are twice as efficient. "Your prism attendants have become increasingly mesmerized with something in the light - or maybe something beyond it; beyond us all, perhaps?"
Own 250 Prisms
Prisms are twice as efficient. "Oh man, this is really messing with your eyes."
Own 300 Prisms
Prisms are twice as efficient. "Designed to filter more light back into your prisms, reaching levels of brightness that reality itself had never planned for.
Reverse theory of light
Own 350 Prisms
Prisms are twice as efficient. "A whole new world of physics opens up when you decide that antiphotons are real and posit that light is merely a void in shadow."
Light capture measures
Own 400 Prisms
Prisms are twice as efficient. "As the universe gets ever so slightly dimmer due to you converting more and more of its light into cookies, you've taken to finding new and unexplored sources of light for your prisms; for instance, the warm glow emitted by a pregnant woman, or the twinkle in the eye of a hopeful child."
Light speed limit
Own 450 prisms
Prisms are twice as efficient. "Whoah, slow down. Harvesting light is well and good but it'd be much easier if it weren't so dang fast! This should thankfully take care of that."
Own 500 prisms
Prisms are twice as efficient. "Invented by Franciscan friar William of Occam in 1327. An impossibly clever use of light theory with a billion possible applications, some of which frightfully destructive. Confined to a single goat-skin parchment for hundreds of years until the patent expired and hit public domain, just now."
15 prisms and 1 grandma owned
Grandmas are twice as efficient. Prisms gain +1% CpS per 12 grandmas. "A luminous grandma to sparkle into cookies."
75 Prisms, 75 Portals and "Synergies Vol. II" purchased
Portals gain +5% CpS per prism. Prisms gain +0.1% CpS per portal. "Someone, or something, is staring back at you. Perhaps at all of us."
75 Prisms, 75 Time machines and "Synergies Vol. II" purchased
Time machines gain +5% CpS per prism. Prisms gain +0.1% CpS per time machine. "From unending times, an ancient light still shines, impossibly pure and fragile in its old age."
15 Wizard towers, 15 Prisms and "Synergies Vol. I" purchased
Wizard towers gain +5% CpS per prism. Prisms gain +0.1% CpS per wizard tower. "Actually not to be taken lightly! No, I'm serious. 178 people died last year. You don't mess around with magic."
75 Temples, 75 Prisms and "Synergies Vol. II" purchased
Temples gain +5% CpS per prism. Prisms gain +0.1% CpS per temple. "Something beckons from within the light. It is warm, comforting, and apparently the cause for several kinds of exotic skin cancers."
15 Prisms, 15 Fractal engines and "Synergies Vol. I" purchased
Prisms gain +5% CpS per fractal engine. Fractal engines gain +0.1% CpS per prism. "Do you have any idea what happens when you point two of these at each other? Apparently, the universe doesn't either."
Random fortune from news ticker
Prisms are 7% more efficient and 7% cheaper. "Staring at a dazzling light can blind you back to darkness."
Part of the flavor text for the Prism upgrade Gem Polish ("Truly, truly outrageous.") is a reference to the 1980s cartoon series Jem, specifically the opening theme. Some believe that it may also be a reference to the League of Legends champion, Taric, but in fact, this is also a reference to the theme from "Jem."
The name of the last achievement, Praise the Sun, is a reference to a famous quote from the game Dark Souls.
Inside of the code for the beta version of the game, you can find an achievement "The Dark Side of The Moon" with flavor text "oh god", which requires to have 1000 prisms. It is not added to the final game and Orteil left a commentary after it which says: "this is a joke I promise". Its name is also a reference to the Pink Floyd album of the same name.
This building has a fixed distance between each building on the X axis, similar to Antimatter Condensers and Chancemakers.
The upgrade "Lux sanctorum" may reference the book of same name and is "holy light" in Latin.