Spacing is everything with this board and it's not right, not yet.
This is for outside in the front yard of the Patrick John Mills Gallery so Silicon is being used to affix the keys with the expectation that it will hold in sub-zero temps. The row of hearts will be perfect as they are those water-filled plastic ice cubes.
This is a very rough prototype. Cinnamon candy hearts
may be added. There are a few on various keys but more are needed.