truncated domes/ taxtile pavement

its been around since 1980s. it is textured pavement that is used to indicate or warn a blind person when there is danger, a curb or a bike path. different patterns and textures/colors are different for each indicator. ex. blister indicates pedestrian crossing, or curb. offset blister indicates when there is a bus stop or train tracks.

we want to create a texture pattern in the bathroom so that a blind person can run their cane over the texture and know that there is something above it like paper towel, stall handle or soap. because some people do not feel with their hands but use their cane, they are somtimes not able to locate something that does not reach all the way to the ground. we would like to create a new texture that communicates, look up or above.