exDM69 says>"The important bit is generating sharp impulse clicks to listen to. You can make clicks with your mouth but your tongue will get tired soon. You can also try a handheld clicker like used in behavioral conditioning for dogs. I try to make a directional sound pointed left or right."

I'm surprised that, by now, there is not a "sonic flashlight" for blind people - something that emits clicks and/or other useful sounds and can be held in the hand, mounted on the head or on eyeglasses.

I puzzled over using sound to help blind people sense the environment more than 50 years ago but put it aside. Since then I have periodically encountered the same or similar solutions but very few actual implementations: I see nothing today more advanced than ideas 50 or more years old. I must sadly conclude that there is no significant economic benefit to these ideas and that indeed the blind are the children "of a lesser god":

"I found Him in the shining of the stars,

I mark'd Him in the flowering of His fields,

But in His ways with men I find Him not.

I waged His wars, and now I pass and die.

O me! for why is all around us here

As if some lesser god had made the world,

But had not force to shape it as he would,

Till the High God behold it from beyond,

And enter it, and make it beautiful?

Or else as if the world were wholly fair,

But that these eyes of men are dense and dim,

And have not power to see it as it is:

Perchance, because we see not to the close;—

For I, being simple, thought to work His will,

And have but stricken with the sword in vain;

And all whereon I lean'd in wife and friend

Is traitor to my peace, and all my realm

Reels back into the beast, and is no more.

My God, thou hast forgotten me in my death:

Nay—God my Christ—I pass but shall not die."*

from Idylls of the King: The Passing of Arthur BY ALFRED, LORD TENNYSON

https://www.poetryfoundation.org/poems/45325/idylls-of-the-k...