Helen Hadsell shared a story about this.
As an experiment while sitting on a park bench, she visualized a shiny silver dollar on the sidewalk till it felt quite solid to her.
Most folks paid no heed, but a woman passed with her child, in a stroller.
The child reached out and repeatedly tried to pick up the coin. Later an older gent passed , looked down at the "coin' , and winked at Helen.

I've never yet tried this stuff.