Bridges are perhaps the most invisible form of public architecture.

Your most precious valued possessions and your greatest powers are invisible and intangible. No one can take them. You and you alone can give them. You will receive abundance for your giving.

Being gay and being a woman has one big thing in common which is that we both become invisible after the age of 42. Who wants a gay 50-year-old? No one let me tell you.

For age is opportunity no less Than youth itself though in another dress And as the evening twilight fades away The sky is filled with stars invisible by day.

It were a real increase of human happiness could all young men from the age of nineteen be covered under barrels or rendered otherwise invisible and there left to follow their lawful studies and callings till they emerged sadder and wiser at the age of twenty-five.