diff --git a/ontime_clocks/nodes.lua b/ontime_clocks/nodes.lua
index 7b15369..9ae474c 100644
--- a/ontime_clocks/nodes.lua
+++ b/ontime_clocks/nodes.lua
@@ -47,6 +47,7 @@ minetest.register_node("ontime_clocks:green_digital", {
 	},
 	tiles = {"ontime_clocks_digital.png"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 13/32 - 0.01,
@@ -81,6 +82,7 @@ minetest.register_node("ontime_clocks:red_digital", {
 	},
 	tiles = {"ontime_clocks_digital.png"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 13/32 - 0.01,
@@ -114,6 +116,7 @@ minetest.register_node("ontime_clocks:white", {
 	},
 	tiles = {"ontime_clocks_white.png"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 6/16 - 0.01,
@@ -148,6 +151,7 @@ minetest.register_node("ontime_clocks:frameless_black", {
 	},
 	tiles = {"ontime_clocks_frameless.png"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 7/16,
@@ -182,6 +186,7 @@ minetest.register_node("ontime_clocks:frameless_gold", {
 	},
 	tiles = {"ontime_clocks_frameless.png^[colorize:#FF0"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 7/16,
@@ -216,6 +221,7 @@ minetest.register_node("ontime_clocks:frameless_white", {
 	},
 	tiles = {"ontime_clocks_frameless.png^[colorize:#FFF"},
 	groups = {oddly_breakable_by_hand=1, not_blocking_trains=1, display_api=1},
+	is_ground_content = false,
 	display_entities = {
 		["ontime_clocks:display"] = {
 			depth = 7/16,
diff --git a/signs_api/init.lua b/signs_api/init.lua
index 121c947..4b02f4e 100644
--- a/signs_api/init.lua
+++ b/signs_api/init.lua
@@ -170,6 +170,7 @@ function signs_api.register_sign(mod, name, model)
 					 model.width/2, model.height/2, 0.5 - model.depth},
 		},
 		groups = {choppy=2, dig_immediate=2, not_blocking_trains=1, display_api=1,signs_api_formspec_lbm=1},
+		is_ground_content = false,
 		sounds = default.node_sound_defaults(),
 		display_entities = {
 			["signs:display_text"] = {
@@ -183,21 +184,21 @@ function signs_api.register_sign(mod, name, model)
 		},
 		on_place = display_api.on_place,
 		on_construct = 	function(pos)
-				local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
-				local meta = minetest.get_meta(pos)
-				meta:set_string("font", ndef and ndef.display_entities.font_name or
-				                        font_api.get_default_font_name())
-				signs_api.set_formspec(pos)
-				display_api.on_construct(pos)
-			end,
+			local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
+			local meta = minetest.get_meta(pos)
+			meta:set_string("font", ndef and ndef.display_entities.font_name or
+						font_api.get_default_font_name())
+			signs_api.set_formspec(pos)
+			display_api.on_construct(pos)
+		end,
 		on_destruct = display_api.on_destruct,
 		on_blast = display_api.on_blast,
 		on_rotate = signs_api.on_rotate,
 		on_receive_fields =  signs_api.on_receive_fields,
 		on_punch = function(pos, node, player, pointed_thing)
-				signs_api.set_formspec(pos)
-				display_api.update_entities(pos)
-			end,
+			signs_api.set_formspec(pos)
+			display_api.update_entities(pos)
+		end,
 	}
 
 	-- Node fields override
diff --git a/steles/nodes.lua b/steles/nodes.lua
index d805adf..05cc71d 100644
--- a/steles/nodes.lua
+++ b/steles/nodes.lua
@@ -61,6 +61,7 @@ for i, material in ipairs(steles.materials) do
 				},
 			},
 			groups = groups,
+			is_ground_content = false,
 			display_entities = {
 				["steles:text"] = {
 						on_display_update = font_api.on_display_update,
@@ -72,32 +73,32 @@ for i, material in ipairs(steles.materials) do
 				},
 			},
 			on_place = function(itemstack, placer, pointed_thing)
-					minetest.rotate_node(itemstack, placer, pointed_thing)
-					return display_api.on_place(itemstack, placer, pointed_thing)
-				end,
+				minetest.rotate_node(itemstack, placer, pointed_thing)
+				return display_api.on_place(itemstack, placer, pointed_thing)
+			end,
 			on_construct = 	function(pos)
-					set_formspec(pos)
-					display_api.on_construct(pos)
-				end,
+				set_formspec(pos)
+				display_api.on_construct(pos)
+			end,
 			on_rightclick = function(pos)
-					set_formspec(pos)
-				end,
+				set_formspec(pos)
+			end,
 			on_destruct = display_api.on_destruct,
 			on_blast = display_api.on_blast,
 			on_rotate = display_api.on_rotate,
 			on_receive_fields = function(pos, formname, fields, player)
-					if not minetest.is_protected(pos, player:get_player_name()) then
-						local meta = minetest.get_meta(pos)
-						if fields.ok or fields.font then
-							meta:set_string("display_text", fields.display_text)
-							meta:set_string("infotext", "\""..fields.display_text.."\"")
-							display_api.update_entities(pos)
-						end
-						if fields.font then
-							font_api.show_font_list(player, pos)
-						end
+				if not minetest.is_protected(pos, player:get_player_name()) then
+					local meta = minetest.get_meta(pos)
+					if fields.ok or fields.font then
+						meta:set_string("display_text", fields.display_text)
+						meta:set_string("infotext", "\""..fields.display_text.."\"")
+						display_api.update_entities(pos)
 					end
-				end,
+					if fields.font then
+						font_api.show_font_list(player, pos)
+					end
+				end
+			end,
 			on_punch = display_api.update_entities,
 		})
 	end