| Mind flash | 10 |
| Mental invention | 16 |
| Mental glimmering | 17 |
| Mental glimmer | 14 |
| Matter of the mind | 18 |
| Madison Avenue product | 22 |
| Lightbulbin toons | 17 |
| Lightbulb, in comics | 20 |
| Lightbulb source? | 17 |
| Lightbulb in a comic strip | 26 |
| Lightbulb in toons | 19 |
| Light-bulb lighter | 18 |
| Light in the attic? | 19 |
| Light bulb's symbolic meaning | 33 |
| Light bulb's signification, in cartoons | 43 |
| Light bulb, to a toon | 21 |
| Light bulb, in the funnies | 26 |
| Light bulb, in comic strips | 27 |
| Light bulb, in a comic strip | 28 |
| LCD Soundsystem might come up with a "Big" one | 56 |
| Kickstarter project's genesis | 33 |
| Just think of it! | 17 |
| Just think of it | 16 |
| Item in a writer's notebook | 31 |
| It's out of your mind | 25 |
| It's out of one's mind | 30 |
| It's in your mind | 21 |
| It starts in your head | 22 |
| It pops into the head | 21 |
| It might pop into your head | 27 |
| It might just come to you | 25 |
| It might be radical | 19 |
| It might be harebrained | 23 |
| It might be half-baked | 22 |
| It might be crazy | 17 |
| It may come from nowhere | 24 |
| It may be just a hunch | 22 |
| It may be big | 13 |
| It has a germ | 13 |
| It could just come to mind | 26 |
| It could be a very good thought | 31 |
| It can come to a head | 21 |
| It can be fixed | 15 |
| It begins at conception | 23 |
| Inventor's specialty | 24 |
| Inventor's or author's quest | 36 |
| Inventor's inkling | 22 |
| Inventor's incentive | 24 |
| Inventor's first step | 25 |
| Inventor's brilliant notion | 31 |
| Inventor's brainchild | 25 |
| Inventor's "lightbulb" | 36 |
| Inventor's "light bulb" | 37 |
| Invention's beginning | 25 |
| Invention starter | 17 |
| Invention start | 15 |
| Invention preceder | 18 |
| Invention necessity | 19 |
| Invention germ | 14 |
| Intellection product | 20 |
| Intangible spark | 16 |
| Inspiration for an author | 25 |
| Innovator's spark | 21 |
| Innovator's breakthrough | 28 |
| Imagine that! | 13 |
| Imagine that | 12 |
| Hunch, say | 10 |
| Have no ____: baffled | 21 |
| Gray-matter creation | 20 |
| Gray matter product | 19 |
| Gray cells' product | 23 |
| Good piece of one's mind? | 29 |
| Germ of an invention | 20 |
| Germ of a patent | 16 |
| Germ for a TV pitch | 19 |
| Germ for a novel | 16 |
| Germ for a Madison Ave. product | 31 |
| Genesis of a plan | 17 |
| General impression | 18 |
| Fully-grown germ? | 17 |
| Formulated thought | 18 |
| Form an image of | 16 |
| Flash of sorts | 14 |
| Flash in the brainpan? | 22 |
| Flash in the brainpan | 21 |
| Figment | 7 |
| Fancy; inkling | 14 |
| Fancy this | 10 |
| Exclamation point? | 18 |
| Evernote note | 13 |
| Essay's basis | 17 |
| Entrepreneur's starting point | 33 |
| Embryonic invention | 19 |
| Edison product | 14 |
| Designer's need | 19 |
| Darkness "Seemed Like a Good ___ at the Time" | 55 |
| Cure for writer's block | 27 |
| Crossword constructor's germ | 32 |
| Creative morsel | 15 |
| Cranial concoction | 18 |