We are redesigning our garden. We have 2 levels, the lower level at the house has a patio. Steps go up to a level app. 4 foot above. We have taken down a metal railing as we are about to rebuild the retaining wall. This has opened up the space and view. However, we have small children and worry that they may fall from the higher level to the patio. Does anyone have any suggestions to make this child friendly without having any unsightly fence?