diff --git a/src/geoflow/core_nodes.hpp b/src/geoflow/core_nodes.hpp
index 233885f..7f87e99 100644
--- a/src/geoflow/core_nodes.hpp
+++ b/src/geoflow/core_nodes.hpp
@@ -211,6 +211,7 @@ namespace geoflow::nodes::core {
                     vector_output(node_name+"."+term_name).push_back_any(data);
                   }
                 } else {
+                  std::cout << "pushing empty any for " << node_name+"."+term_name << "at i=" << i << std::endl;
                   vector_output(node_name+"."+term_name).push_back_any(std::any());
                 }
               } else {
diff --git a/src/geoflow/geoflow.cpp b/src/geoflow/geoflow.cpp
index 698c57f..f7efaaa 100644
--- a/src/geoflow/geoflow.cpp
+++ b/src/geoflow/geoflow.cpp
@@ -104,7 +104,7 @@ const std::vector<std::any>& gfSingleFeatureInputTerminal::get_data_vec() const
   auto sot = (gfSingleFeatureOutputTerminal*)(output_term.get());
   return sot->get_data_vec();
 }
-size_t gfSingleFeatureInputTerminal::size() {
+size_t gfSingleFeatureInputTerminal::size() const {
   auto output_term = connected_output_.lock();
   auto sot = (gfSingleFeatureOutputTerminal*)(output_term.get());
   return sot->size(); 
@@ -255,7 +255,7 @@ bool gfMultiFeatureInputTerminal::is_touched() {
   }
   return false;
 }
-size_t gfMultiFeatureInputTerminal::size() {
+size_t gfMultiFeatureInputTerminal::size() const{
   if (connected_outputs_.size()==0)
     return 0;
   else
@@ -279,7 +279,7 @@ bool gfMultiFeatureOutputTerminal::has_data() const {
   }
   return true;
 }
-size_t gfMultiFeatureOutputTerminal::size() {
+size_t gfMultiFeatureOutputTerminal::size() const {
   if (terminals_.size()==0)
     return 0;
   else
diff --git a/src/geoflow/geoflow.hpp b/src/geoflow/geoflow.hpp
index 7f21451..449ff82 100644
--- a/src/geoflow/geoflow.hpp
+++ b/src/geoflow/geoflow.hpp
@@ -139,7 +139,7 @@ namespace geoflow {
     }
     const gfIO get_side() { return GF_IN; };
     bool is_optional() { return is_optional_; };
-    virtual size_t size() = 0;
+    virtual size_t size() const = 0;
 
     friend class gfOutputTerminal;
     friend class gfSingleFeatureOutputTerminal;
@@ -170,7 +170,7 @@ namespace geoflow {
     const gfTerminalFamily get_family() { return GF_SINGLE_FEATURE; };
     template<typename T> const T get(size_t i);
     const std::vector<std::any>& get_data_vec() const;
-    size_t size();
+    size_t size() const;
 
     friend class gfSingleFeatureOutputTerminal;
   };
@@ -202,7 +202,7 @@ namespace geoflow {
     void connect(gfInputTerminal& in);
     void disconnect(gfInputTerminal& in);
 
-    virtual size_t size()=0;
+    virtual size_t size() const=0;
     void set_type(std::type_index type) {types_ = {type}; }
 
     void touch() { is_touched_=true; };
@@ -265,7 +265,7 @@ namespace geoflow {
     }
 
     // multi element
-    size_t size() { return data_.size(); };
+    size_t size() const { return data_.size(); };
     template<typename T>void resize(size_t n) {
       return data_.resize(n, T());
     };
@@ -329,7 +329,7 @@ namespace geoflow {
     bool has_data() const;
     bool is_touched();
     bool has_connection() {return connected_outputs_.size() > 0; };
-    size_t size();
+    size_t size() const;
 
     const SubTermRefs& sub_terminals() { return sub_terminals_; };
     // const BasicRefs& basic_terminals() { return basic_terminals_; };
@@ -357,7 +357,7 @@ namespace geoflow {
     using gfOutputTerminal::gfOutputTerminal;
     const gfTerminalFamily get_family() { return GF_MULTI_FEATURE; };
     bool has_data() const;
-    size_t size();
+    size_t size() const;
 
     // note these 2 are almost the same now:
     gfSingleFeatureOutputTerminal& add(std::string term_name, std::type_index ttype ) ;
diff --git a/src/geoflow/gui/ImNodesEz.cpp b/src/geoflow/gui/ImNodesEz.cpp
index cbc79ec..a22dd46 100644
--- a/src/geoflow/gui/ImNodesEz.cpp
+++ b/src/geoflow/gui/ImNodesEz.cpp
@@ -160,9 +160,23 @@ bool Slot(geoflow::gfTerminal* term, int kind)
                         ImGui::SameLine(); ImGui::Text("(size: %lu)", ot->size());
                     }
                 }
-            } else if (term->get_family()==geoflow::GF_MULTI_FEATURE )
-                ImGui::TextUnformatted("Family: Multi Feature");
-            else
+            } else if (term->get_family()==geoflow::GF_MULTI_FEATURE ) {
+                if(term->get_side()==geoflow::GF_IN) {
+                    ImGui::TextUnformatted("Family: Multi Feature");
+                    auto* it = (geoflow::gfMultiFeatureInputTerminal*) term;
+                    for (auto& subterm : it->sub_terminals()) {
+                        ImGui::Text(" %lu %s, ", subterm->size(), subterm->get_name().c_str());
+                        // ImGui::Text("  %s)", subterm->get_type().name());
+                    }
+                } else {
+                    ImGui::TextUnformatted("Family: Multi Feature");
+                    auto* it = (geoflow::gfMultiFeatureOutputTerminal*) term;
+                    for (auto& [name, subterm] : it->sub_terminals()) {
+                        ImGui::Text(" %lu %s, ", subterm->size(), subterm->get_name().c_str());
+                        // ImGui::Text("  %s)", subterm->get_type().name());
+                    }
+                }
+            } else
                 ImGui::TextUnformatted("Family: Unknown");
             
             ImGui::Text("Compatible types:");